2011 Pacific hurricane season, Systems, Hurricane Beatriz
Late on June 20, Beatriz was upgraded to a hurricane, with winds of 75 mph (120 km/h) and a pressure of 985 mbar (29.1 inHg). Beatriz continued to strengthen and reached winds of 90 mph (145 km/h) and a pressure reading of 977 mbar (28.9 inHg) while it neared the coast of Mexico. After moving along the coast, it weakened to a tropical storm and dissipated the next day. But the NHC noted that Beatriz's remnants still had a near 0% chance of redeveloping, as they remained almost stationary. But on June 23, convection dissipated, and Beatriz's remnants slowly began to accelerate to the west, as the remnant low dissipated rapidly. Late on June 24, the remnants of Hurricane Beatriz dissipated completely, to the southwest of the Baja California Peninsula.


2011 Pacific hurricane season, Systems, Hurricane Beatriz
Several landslides blocked off roads and a 100 m (330 ft) section of a roundabout was destroyed. In the community of Amatillo, three people were killed after being washed away by flood waters. Heavy rains from Beatriz caused the Sabana River to overflow its banks, placing 150 homes across 14 colonias under water.


2011 Pacific hurricane season, Systems, Hurricane Calvin
On July 5, an area of showers and thunderstorms formed south of the Gulf of Tehuantepec associated with a broad area of low pressure. The system slowly organized, and the National Hurricane Center designated the system Tropical Depression Three-E on July 7. By the next day, the tropical depression gained enough organization to be named Calvin. Calvin strengthened into a hurricane and attained peak strength early on July 9 before rapidly weakening later that day. Calvin degenerated into a remnant low early on July 10. During the next 3 days, Calvin's remnants quickly moved to the west, while dissipating rapidly. On July 13, Calvin's remnants dissipated completely, just to the east of the Central Pacific Ocean.


2011 Pacific hurricane season, Systems, Hurricane Dora
In the early morning hours of July 14, a tropical wave had moved off the Colombian coast. The wave gained convection as it moved into the southwestern Caribbean, and the National Hurricane Center (NHC) began to monitor the disturbance, giving it a 10% chance of development into a tropical cyclone. Over the rest of the day, the storm continued to move westward until it moved ashore on the Nicaragua/Costa Rica border the next day. On July 16, the National Hurricane Center began monitoring the area of low pressure off the coast of Guatemala.


2011 Pacific hurricane season, Systems, Hurricane Dora
Slowly organizing, the low-pressure area had gained enough strength to be declared Tropical Depression Four-E during the morning hours of July 18. Just three hours later, the system was upgraded to Dora, the fourth tropical storm of the 2011 Pacific hurricane season. Continuing to organize, Dora reached hurricane strength late on July 20, before rapidly intensifying into a major hurricane later the next day. Strengthening further, Dora reached a peak of 155 mph (250 km/h) early on July 21, making it a Category 4 hurricane on the Saffir–Simpson hurricane scale.


2011 Pacific hurricane season, Systems, Hurricane Dora
However, after entering cooler waters, Dora began to weaken the next day. On July 23, Dora was downgraded to a tropical storm, and the next day, Dora was no longer a tropical cyclone. As a remnant low, the circulation began to curve around the high-pressure area that had steered Dora for much of its existence on July 25. Early on July 26, the remnants of Hurricane Dora dissipated completely, over Central Baja California.


2011 Pacific hurricane season, Systems, Hurricane Eugene
On early July 31, a tropical wave developed into a tropical depression in the eastern Pacific a few hundred miles south of Mexico. Meteorologists numbered it "Five-E". It was upgraded to Tropical Storm Eugene only 6 hours after becoming a tropical depression. On the afternoon of August 1, Eugene strengthened into a Category 1 hurricane on the Saffir–Simpson hurricane scale. The next day Eugene further strengthened into a Category 2 hurricane. Early on August 3 Eugene further strengthened into a Category 3 hurricane, making it the third major hurricane of the season.


2011 Pacific hurricane season, Systems, Hurricane Eugene
Eugene was expected to weaken after becoming a Category 3. However, on the afternoon of August 3, Eugene strengthened into a Category 4 hurricane on the Saffir–Simpson hurricane scale with winds up to 140 mph (225 km/h). Eugene only maintained Category 4 status briefly, and only six hours later, the hurricane weakened to a Category 3 with winds up to 125 mph (200 km/h). Eugene quickly weakened on August 5 because of unfavorable conditions, dropping from Category 2 status to tropical storm status in only 18 hours.


2011 Pacific hurricane season, Systems, Hurricane Eugene
On August 6, Eugene became a post-tropical low as the center of the storm was void of strong convection. During the next few days, Eugene's remnants continued to move westward slowly, while weakening gradually. On August 10, the remnants of Hurricane Eugene dissipated roughly 980 mi (1,555 km) east of Hawaii.


2011 Pacific hurricane season, Systems, Tropical Storm Fernanda
The tropical wave that spawned Tropical Storm Emily in the Atlantic Ocean crossed Central America into the East Pacific on August 6. Producing disorganized deep convection, a surface circulation became discernible on August 13, and the formation of showers and thunderstorms in curved bands around the circulation signified the formation of Tropical Depression Six-E by 18:00 UTC on August 15, about 1,400 nautical miles east-southeast of Hawai'i. An increase deep convection resulted in the depression strengthening into Tropical Storm Fernanda at 6:00 UTC the next morning.


2011 Pacific hurricane season, Systems, Tropical Storm Fernanda
A relaxation in shear allowed Fernanda to become more organized and reach an intensity of 45 knots (50 mph) later that day. Fernanda initially moved west under the influence of a subtropical ridge, but it turned northwest through a weakness in the ridge on August 17 into more favorable conditions and strengthened to a peak intensity of 70 mph winds and a minimum pressure of 992 millibars at 6:00 UTC on August 18. Fernanda was the only named storm this season not to clear hurricane strength.


2011 Pacific hurricane season, Systems, Tropical Storm Fernanda
Shortly after reaching peak intensity, the storm crossed into the Central Pacific basin. Continuing west-northwestward, Fernanda began weakening late on August 18 as dry, stable air was entrained into its circulation and it encountered increasing south-southeasterly shear. Most of Fernanda's deep convection had dissipated by August 20, and it degenerated to a remnant low. The post-tropical low continued westward before dissipating the next day a couple hundred nautical miles south of the Hawaiian Islands.


2011 Pacific hurricane season, Systems, Hurricane Greg
On the afternoon of August 16, a vigorous area of low pressure developed into Tropical Depression Seven-E. It was upgraded to Tropical Storm Greg 12 hours after formation. The storm steadily intensified over 85 °F (29 °C) sea surface temperatures and it reached hurricane status late on August 17 with maximum sustained winds of 75 mph. Greg continued strengthening to attain peak winds of 85 mph and a pressure of 980 mbar.


2011 Pacific hurricane season, Systems, Hurricane Greg
Soon afterward, the storm began to gradually weaken due to cooler waters and higher wind shear and on August 19, Greg weakened to tropical storm strength, with maximum sustained winds of 65 mph. The storm continued to weaken as it encountered unfavorable wind shear and as it began to traverse cooler waters, and on August 20 Greg had weakened to a tropical depression. Greg maintained tropical depression status until August 21, when it degenerated into a remnant low. During that day, Greg's remnants moved northeastward due to a High Pressure System.


2011 Pacific hurricane season, Systems, Hurricane Greg
From late on August 22, until the early afternoon of August 23, Greg's remnants impacted Southern California, bringing overcast skies, even though the center of circulation itself moved southeastward slowly and was positioned far southwest of Southern California. Greg's remnants continued to drift westwards, as they weakened rapidly. Late on August 24, the remnants of Hurricane Greg dissipated completely, far west of the southern tip of the Baja California Peninsula.


2011 Pacific hurricane season, Systems, Tropical Depression Eight-E
The National Hurricane Center (NHC) began to monitor an area of disturbed weather southwest of the Mexican Riviera in late August. Initially, poorly organized, environmental conditions were conductive for some development. Shortly thereafter, the cloud patterns improved and overall thunderstorm activity increased. Thunderstorm activity become more concentrated two days later while located 60 mi (97 km) south of Zinhuatnejo, and the NHC noted that the disturbance could become a tropical depression within hours. This held true, and at 1500 UTC August 31, the low was upgraded into a tropical depression, but no further intensification was anticipated.


2011 Pacific hurricane season, Systems, Tropical Depression Eight-E
Eight-E soon made landfall on Southwestern Mexico, and moved north-northwestwards, as it rapidly weakened. Eight-E dissipated to a remnant low several hours later, early on September 1. However, the remnants of Tropical Depression Eight-E survived, and they as they began moving westward, the remnants impacted Western Mexico. During the early afternoon of September 1, the remnants of Eight-E moved off the western coast of Western Mexico. During the next day, the remnants strengthened slightly in intensity, as it moved northwestward, towards the Baja California Peninsula. But late on September 2, the remnants of Tropical Depression Eight-E dissipated completely, just southeast of the peninsula.


2011 Pacific hurricane season, Systems, Hurricane Hilary
A tropical disturbance gained enough organization early on September 21 to be declared as a tropical depression, the ninth of the season. Continuing to organize, the depression strengthened into a tropical storm several hours later. On September 22, the meteorologists declared Hilary as a Category 1 hurricane, becoming the seventh of the season. On September 22, it rapidly strengthened into a small, Category 4 hurricane, featuring a well-defined eye and very deep convection. It later reached a peak intensity of 145 mph (235 km/h) at 0600 UTC September 23 (11 p.m. AST September 22).


2011 Pacific hurricane season, Systems, Hurricane Hilary
However, the storm began to enter an area of higher wind shear and cooler ocean temperatures on September 24, and Hilary began to weaken. The hurricane weakened back down to a Category 3 hurricane early on September 25, but was later upgraded briefly to a Category 4 again the following afternoon. Several hours later, the storm was once again downgraded into a Category 3 hurricane, and during the afternoon hours of September 27, Hilary was further downgraded into a Category 2 hurricane.


2011 Pacific hurricane season, Systems, Hurricane Hilary
Early the following morning, Hilary weakened into a Category 1 hurricane, and weakened into a tropical storm on September 28. Losing a lot of its convection on September 30, the National Hurricane Center noted that Hilary had weakened into a tropical depression. Several hours later, after sustaining no deep convection atop its centre, Hilary was declared a remnant low, located several hundred miles away from any landmasses. Over the next 3 days Hilary's remnant low subsequently moved towards the southwest, before dissipating after 1200 UTC on October 3, about 1,050 mi (1,690 km) to the west of the southern tip of Baja California.


2011 Pacific hurricane season, Systems, Hurricane Hilary
Tropical cyclone warnings and watches were also issued for portion of the coast. Large swells were also expected. A red (emergency) alert was issued for parts of the coast. Officials urged residents to be prepared to evacuate. The port of Acapulco was closed for small craft. A moderate to high alert of rain and wind was noted. The storm's outer bands produced heavy rainfall over Chiapas and Tabasco, with accumulations in Tabasco reaching 8.58 in (218 mm) in 24 hours. Several rivers across the region overflowed their banks and flooded nearby areas. In Villahermosa, heavy rain collapsed drains and many streets were flooded. In addition, cars were stranded in floodwaters. Across Colima, waves reached 9 to 15 ft (2.7 to 4.6 m).


2011 Pacific hurricane season, Systems, Hurricane Jova
During the late hours of October 4, an area of showers and thunderstorms associated with a broad low-pressure area developed several hundred miles to the south-southwest of Acapulco, Mexico. Moving slowly towards the west, the area of disturbed weather quickly organized. Late on October 5, the National Hurricane Center (NHC) noted that the area had a high chance of developing into a tropical cyclone over the next 48 hours. Just several hours later, the NHC began issuing advisories on Tropical Depression Ten-E, several hundred miles to the south of Manzanillo, Mexico.


2011 Pacific hurricane season, Systems, Hurricane Jova
A more gradual type of development took place after then, and the depression was upgraded into Tropical Storm Jova on the afternoon of October 6. Taking advantage of the favorable environment Jova was embedded within, the storm became a hurricane on October 8, and by October 10, the storm was upgraded to a Category 3 hurricane on the Saffir–Simpson hurricane scale. However, shortly thereafter, the storm began an eyewall replacement cycle and weakened to a lower-end Category 2 hurricane. Several hours after landfall in Mexico, Jova dissipated, very early on October 13.


2011 Pacific hurricane season, Systems, Hurricane Irwin
The origins of Hurricane Irwin can be tracked back to an area of showers and thunderstorms associated with a low-pressure area that developed several hundred miles to the south of Mexico. Moving towards the west and west-northwest, the low pressure quickly gained organization, and during the pre-dawn hours of October 6, the National Hurricane Center began issuing advisories on newly formed Tropical Depression Eleven-E. Later on October 6, Tropical Depression Eleven-E strengthened to Tropical Storm Irwin, and it became a hurricane the next day. The next day it weakened to a tropical storm.


2011 Pacific hurricane season, Systems, Hurricane Irwin
Unlike most tropical cyclones that form in the eastern Pacific Ocean, Irwin's track was very unusual. The system which originally started moving westward, turned north, then east and again back south, and east until dissipation, on October 17, as a remnant low. Also, between October 11 and 14, Irwin weakened into a tropical depression twice and again re-strengthened back to a tropical storm before finally weakening into a tropical depression on October 15. The depression turned west again and dissipated into a remnant low in the late hours of October 16. But the remnants of Tropical Storm Irwin continued to move westward generally, until it dissipated completely, on October 17.


2011 Pacific hurricane season, Systems, Tropical Depression Twelve-E
A tropical wave, the same that spawned Hurricane Phillipe in the Atlantic, crossed Central America into the East Pacific on October 5, during a significant pulse of the MJO. In this favorable environment, the wave generated a low-pressure area in the ITCZ by 18:00 UTC on October 6. Despite initially being hindered by the development of easterly wind shear, the low produced sustain deep convection late on October 11, and organized sufficiently to become Tropical Depression Twelve-E by 00:00 UTC on October 12. The depression moved northward without strengthening and made landfall at 16:00 UTC that day near Paredón, Mexico. The depression rapidly weakened to a remnant low eight hours later and dissipated completely early the next day.


2011 Pacific hurricane season, Systems, Tropical Depression Twelve-E
The depression brought torrential rains that caused severe flooding in southeast Mexico and neighboring Guatemala. Up to 12 inches (305 mm) of rain fell in Guatemala, though not all of it may be because of Twelve-E. 36 deaths were directly attributed to the depression by the government of Guatemala. Numerous additional fatalities resulted in Central America from the pulse of the MJO that helped spawn the depression.


2011 Pacific hurricane season, Systems, Hurricane Kenneth
Kenneth originated from an area full of unsettled weather that developed off the coast of Guatemala on November 16. A low-pressure area formed shortly thereafter, and organization of the system began to improve on November 17 as it moved westward. The low remained over an area with favorable conditions for formation on November 18, although convective activity tapered slightly later during the day as it began to curve west-northwestward. The system continued to coalesce overnight, and the circulation of the low was more prominent by the following morning.


2011 Pacific hurricane season, Systems, Hurricane Kenneth
By November 19, the disturbance had gained enough organization to be declared as a tropical depression, the thirteenth of the season. The following day, the depression continued to intensify, and was upgraded to a tropical storm, receiving the name Kenneth. Rapid strengthening began on November 21, and Kenneth was upgraded to a hurricane. As rapid intensification continued, Kenneth strengthened into a Category 3 major hurricane with sustained winds of 125 mph on November 22.


2011 Pacific hurricane season, Systems, Hurricane Kenneth
Rapid intensification continued and the storm was upgraded to a Category 4 hurricane with sustained winds of 145 mph, just a few hours later, as Kenneth reached its peak intensity. The cause for this rapid intensification just days before the end of the season was unclimatologically low wind shear as well as unusually warm waters directly in the storm's path. However, Kenneth's intensification was short-lived; immediately it moved into an environment of colder waters and stronger wind shear, and started to rapidly deteriorate.


2011 Pacific hurricane season, Systems, Hurricane Kenneth
Just 24 hours after the cyclone reached its peak, it dropped below hurricane strength and lost most of its central convection. Afterwards, Kenneth weakened at a slower rate, but by November 25, had weakened to a tropical depression, losing almost all of its convection. Early on November 25, Kenneth weakened to a remnant low, with its circulation void of any strong convection. But for the next 3 days, the remnant of the storm continued moving northwestward rapidly as a convectionless vortex, before dissipating completely early on November 28.


2011 Pacific hurricane season, Systems, Hurricane Kenneth
In the first discussion bulletin, Forecaster Robbie Berg commented that it was the latest-forming tropical cyclone in the North Pacific east of 140°W since Tropical Depression Twenty-Two-E on November 24, 1987, and Kenneth was the latest forming named storm since Winnie in 1983. Kenneth strengthened to a major hurricane on November 22, becoming the latest-forming major hurricane in the eastern north Pacific basin in the satellite era. Kenneth was upgraded to Category 4 a few hours later, becoming the most powerful late-season storm ever recorded in the eastern north Pacific. However, 2015's Hurricane Sandra surpassed both records when it attained major hurricane status much later than Kenneth, being upgraded to a Category 4 on November 26, 2015.


2011 Pacific hurricane season, Storm names
The following names were used for named storms that formed in the North East Pacific in 2011. Names that were not used are marked in gray. This is the same list used in the 2005 season. No names were retired this year, so this list was used again in the 2017 season.


2011 Pacific hurricane season, Storm names
For storms that form in the Central Pacific Hurricane Center's area of responsibility, encompassing the area between 140 degrees west and the International Date Line, all names are used in a series of four rotating lists. The next four names that were slated for use in 2011 are shown below; however, none of them were used.


2011 Pacific hurricane season, Season effects
This is a table of all of the storms in the 2011 Pacific hurricane season. It includes their durations, peak intensities, names, landfall(s), damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but are still storm-related. Damage and deaths include totals while the storm was extratropical or a wave or a low. All of the damage figures are in 2011 USD.


2011 Pacific typhoon season
The 2011 Pacific typhoon season was a below average season that produced a total of 21 named storms, 8 typhoons, and four super typhoons. This season was much more active than the previous season, although both seasons were below the Pacific typhoon average of 26. The season ran throughout 2011, though most tropical cyclone tend to develop between May and October. The season's first named storm, Aere, developed on May 7 while the season's last named storm, Washi dissipated on December 19.


2011 Pacific typhoon season
The season was also much deadlier and destructive than the previous season. Typhoon Muifa affected many countries during August. Tropical Storm Talas and Typhoon Roke made landfall over in Japan and were the most destructive since 2009. Typhoon Nesat was the most powerful to strike China since 2005. Tropical Storm Washi, a late but weak cyclone, affected southern Philippines and killed 2546 people.


2011 Pacific typhoon season
The scope of this article is limited to the Pacific Ocean to the north of the equator between 100th meridian east and the 180th meridian. Within the Northwestern Pacific Ocean, there are two separate agencies who assign names to tropical cyclones which can often result in a cyclone having two names. The Japan Meteorological Agency will name a tropical cyclone should it be judged to have 10-minute sustained wind speeds of at least 65 km/h, (40 mph) anywhere in the basin.


2011 Pacific typhoon season
Whilst the Philippine Atmospheric, Geophysical and Astronomical Services Administration assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N-25°N even if the cyclone has had a name assigned to it by the Japan Meteorological Agency. Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center are given a number with a "W" suffix.


2011 Pacific typhoon season, Seasonal forecasts
During each season, several national meteorological services and scientific agencies forecast how many tropical cyclones, tropical storms, and typhoons will form during a season and/or how many tropical cyclones will affect a particular country. These agencies include the Guy Carpenter Asia-Pacific Climate Impact Centre (GCACIC), of the City University of Hong Kong, the Tropical Storm Risk (TSR) Consortium of the University College London, and the Taiwan's Central Weather Bureau.


2011 Pacific typhoon season, Seasonal forecasts
During January 2011, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) predicted that between twenty and twenty-three tropical cyclones were likely to develop and/or enter the Philippine area of responsibility during 2011. On March 20 the Hong Kong Observatory, predicted that the typhoon season in Hong Kong would be near to above normal with six to nine tropical cyclones passing within 500 km (310 mi) of the territory against an average of around 6.


2011 Pacific typhoon season, Seasonal forecasts
On March 30, the TSR Consortium released their first forecast of the season and predicted that the basin would see a near average season with 27.8 tropical storms, 17.5 typhoons, 7.8 "intense" typhoons and an ACE index of about 275. In early April, the China Meteorological Administration (CMA) predicted that between 24 and 26 tropical storms would develop or move into the basin during the year, which it noted was higher than the previous total of 14.


2011 Pacific typhoon season, Seasonal forecasts
They also predicted that between seven and nine tropical storms would make landfall on China, with the first landing taking place before June 29 and the last landing taking place after October 7. On April 26, the Thai Meteorological Department predicted that two tropical storms would affect Thailand during 2011, with one affecting Upper Thailand during August or September, while one was expected to move through Southern Thailand during October or November.


2011 Pacific typhoon season, Seasonal forecasts
During May within its first outlook for the year, the GCACIC predicted that the season would be near average with 31 tropical cyclones, 27 tropical storms and 17 typhoons developing during the season. They also predicted that seven tropical cyclones would make landfall on Southern China, between May and December, compared with an average of five while predicting that six tropical cyclones during the whole year compared to an average of four tropical cyclones. TSR revised its initial prediction during May and subsequently predicted that 28.0 tropical storms, 17.7 typhoons, 7.6 "intense" typhoons and an ACE index of about 266.


2011 Pacific typhoon season, Seasonal forecasts
In late June after a near-normal start to the season Taiwan's Central Weather Bureau predicted that the season, would be near average of 25.7 with 22–26 tropical storms occurring over the basin during 2011. Between three and five of the systems were predicted to affect Taiwan, compared to an average of around 3.6. Within its July forecast update, the GCACIC predicted that seven tropical cyclones would make landfall on Southern China, between July and December compared to an average of four and that there would now be 16 typhoons due to the strength of the India-Burma trough.


2011 Pacific typhoon season, Seasonal forecasts
They also predicted that seven tropical cyclones would pass within 100 km (62 mi) of the Korean Peninsula or Japan, during July and December compared to an average of around three. Within its July update, TSR predicted that the ACE index would be about 194, after raising its prediction for the number of tropical storms to 28.0, typhoons to 18.1 and intense typhoons to 8.4. On August 4, TSR subsequently slightly revised these predictions within its final update for 2011 to 28.2 tropical storms, 17.9 typhoons, 8.0 "intense" typhoons and an ACE index of about 281.


2011 Pacific typhoon season, Seasonal summary
During April two tropical depressions developed but they failed to intensify into tropical storms. Tropical Storm Aere (Bebeng) then developed on May 5, and after causing PHP 2.25 billion in damage to Northeastern Luzon and Eastern Visayas, the name Bebeng was retired by PAGASA. The second tropical storm of the season then developed on May 19, and affected the Philippines, Taiwan and Japan before becoming extratropical to the east of Japan.


2011 Pacific typhoon season, Seasonal summary
After Tropical Storm Banyan dissipated during October 14, no tropical storms or typhoons were observed within the basin until Tropical Depression 27W developed into Tropical Storm Washi during December 15, due to high vertical windshear and a strong northeast monsoon.


2011 Pacific typhoon season, Systems, Tropical Depression 01W
On April 1, the JMA reported that a tropical depression had developed within an area of moderate vertical wind shear about 510 km (315 mi) to the southeast of Ho Chi Minh City in Southern Vietnam. Over the next day, the system gradually developed further, before the JTWC initiated advisories on the system and designated it as Tropical Depression 01W. However, within hours of this, the depression became devoid of convection as wind shear buffeted the system. This prevented the cyclone from intensifying beyond depression status as it remained nearly stationary. The JMA continued to monitor the system as a tropical depression for another day before issuing their last warning on the system.


2011 Pacific typhoon season, Systems, Tropical Depression 02W (Amang)
On March 30, the JMA began monitoring an area of low pressure located southwest of Yap. By April 2, the system developed a low-level circulation, though convection appeared disorganized. Exhibiting good outflow within a region of weak wind shear, the low was anticipated to develop further over the following several days as it drifted west-northwestward. After briefly stalling early on April 3, the storm turned towards the east. Additionally, the JMA considered the system sufficiently organized to be declared a tropical depression.


2011 Pacific typhoon season, Systems, Tropical Depression 02W (Amang)
As the system was located to the west of 135°E, PAGASA began issuing advisories on the depression as well, assigning it the name "Amang". Tracking northeastward, the depression eventually developed enough convection to be declared Tropical Depression 02W by the JTWC on April 4. However, this was expected to be brief as a decaying frontal boundary approached from the west and prompted the system to undergo an extratropical transition. This intensification prompted the National Weather Service (NWS) in Tiyan, Guam to issue a tropical storm warning for the islands of Agrihan, Pagan and Alamagan. Interacting with the front and high wind shear, the system became partially exposed and elongated as it moved over cooler waters. Early on April 6, the JTWC issued their final advisory on the depression as it began to dissipate over open waters.


2011 Pacific typhoon season, Systems, Tropical Storm Aere (Bebeng)
On May 3, the JTWC started to monitor a tropical disturbance that had developed within a monsoon trough about 140 km (85 mi) to the west of Palau. At this time the disturbances low level circulation center was weak and unorganized, while a minimal amount of deep convection was observed around the system. Over the next couple of days the depression gradually developed further in an area of low vertical wind shear before it was declared a tropical depression by the JMA and the JTWC during May 6.


2011 Pacific typhoon season, Systems, Tropical Storm Aere (Bebeng)
In the same evening, PAGASA upgraded the low pressure into a tropical depression and assigned its local name 'Bebeng'. On the afternoon of May 7, JMA upgraded the depression to a tropical storm and assigned the name 'Aere'. During the early morning of May 12, the JMA downgraded Aere to a tropical depression while south of Kyushu Island as it became a weak extratropical cyclone. It's extratropical remnants finally dissipated on May 15.


2011 Pacific typhoon season, Systems, Tropical Storm Aere (Bebeng)
Throughout the Philippines, multiple agencies activated their emergency plans as the storm approached. The Armed Forces of the Philippines, the Philippine National Police, and the Philippine Coast Guard were all placed on standby to deploy to areas struck by Aere once the storm passed. Several ports were affected by the storm, stranding 1,379 passengers by the afternoon of May 7. According to the National Disaster Risk Reduction and Management Council, at least 35 people have been killed and two more are missing as a result of Aere. Agricultural losses are estimated at PHP1.37 billion (US$31.7 million). Widespread flooding and landslides damaged homes, blocked off roads and severed communications. In Catarman, Northern Samar, 377.4 mm (14.86 in) of rain fell in just 24 hours, resulted in significant flash flooding.


2011 Pacific typhoon season, Systems, Typhoon Songda (Chedeng)
A weak non-tropical system formed within the Intertropical Convergence Zone on May 17, as it moved in a westward direction. On May 19, the JTWC reported that an area of low pressure had persisted about 510 km (320 mi) to the southeast of Yap. As the system moved towards the northwest under the influence of a subtropical ridge of high pressure, it rapidly consolidated in an area of light to moderate vertical wind shear.


2011 Pacific typhoon season, Systems, Typhoon Songda (Chedeng)
The JMA then started to monitor the system as a tropical depression later that day, before the JTWC designated it as Tropical Depression 04W early on May 20. The JTWC then reported later that day that the depression had intensified into a tropical storm with wind speeds of 65 km/h (40 mph), however, it later reported that it had overestimated the wind speeds and consequently lowered the storm's status to a tropical depression, based on observations from Yap island.


2011 Pacific typhoon season, Systems, Typhoon Songda (Chedeng)
Late on May 21, both the JMA and the JTWC reported that the depression had now become a tropical storm with the JMA naming it as Songda. Over the next couple of days, the system gradually intensified further while moving northwest into PAGASA's area of responsibility. PAGASA named it as Chedeng. At 1200  UTC on May 24, the JTWC reported that Songda had intensified into a typhoon. 12 hours later, the JMA followed suit while the system was located about 800 km (500 mi) to the southeast of Manila in the Philippines. It rapidly intensified into a Category 5 typhoon. On the afternoon of May 29, Songda became extratropical south of Shikoku Island. The extratropical remnants of Sonda later crossed the International Date Line, which was later absorbed by another extratropical cyclone on June 4, and later dissipated completely over Alaska.


2011 Pacific typhoon season, Systems, Typhoon Songda (Chedeng)
Although Songda remained offshore, heavy rains within the typhoon's outer bands impacted the Philippines, causing significant flash flooding and landslides. Four fatalities are attributed to the system there. Further north, Okinawa experienced intense wind gusts, measured up to 198 km/h (123 mph), along with torrential rain. Extensive damage took place across the area with losses reaching ¥23.2 billion ($287 million); however, there were no fatalities. As it became extratropical, Songda brought heavy rains from Kyushu to eastern Honshu, causing significant flooding. At least 13 people were killed in the country and an estimated 400,000 had to be evacuated around Tokyo alone.


2011 Pacific typhoon season, Systems, Tropical Storm Sarika (Dodong)
On early June 8, an area of low pressure formed about 10 km (6 mi) west of Cebu City, Philippines. As it moved towards the Mindoro Strait the JMA and JTWC began to monitor the system. In the early morning hours of June 9, the Philippines' PAGASA upgraded the system to a tropical depression and reported the storm center to be about 450 km (280 mi) west of Dagupan City in the Philippines. The next day, the JMA and JTWC upgraded the tropical depression into a tropical storm, with the JMA naming it Sarika. During the morning of June 11, the JTWC downgraded Sarika to a tropical depression after making landfall in Shantou, China. The JTWC soon issued their final advisory on Sarika. Sarika made landfall on mainland China with winds of 75 km/h (45 mph).


2011 Pacific typhoon season, Systems, Tropical Storm Sarika (Dodong)
As a result of the storm, 23 people were killed in Xianning, and ten more were declared missing. Damages from Sarika are estimated at $248 million.


2011 Pacific typhoon season, Systems, Tropical Storm Haima (Egay)
Two tropical disturbances formed in an area of convection and moderate vertical wind shear east of Mindanao, Philippines on June 13. Both of them started to interact with each other and the other one absorbed the moisture of the other disturbance. On June 15, the JTWC started to monitor an area of disturbed weather within that disturbance that was located about 1,350 km (840 mi), to the southeast of Manila, Philippines.


2011 Pacific typhoon season, Systems, Tropical Storm Haima (Egay)
Over the next couple of days the system gradually developed further, before late on June 16, the JMA, JTWC and PAGASA, all reported that the system had developed into a tropical depression, with PAGASA naming it as Egay. Egay continued to develop during June 17, as it moved towards the northeast, and on June 18, the JTWC reported that Egay had intensified into a tropical storm. Fluctuations in intensity occurred over the next several days, before the JMA reported that the system had strengthened into a tropical storm on June 22, naming it Haima. The JTWC also followed suit, by upgrading it to a tropical storm again.


2011 Pacific typhoon season, Systems, Tropical Storm Haima (Egay)
During the evening of June 23, the JTWC downgraded Haima to a tropical depression after making landfall in Zhanjiang, Guangdong, China but upgraded it to a tropical storm again on June 24,. Early on June 25, Haima became a tropical depression after moving inland in Vietnam. As it made landfall over Hanoi, Vietnam, the JTWC and the Hong Kong Observatory downgraded Haima to a low-pressure area.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Meari (Falcon)
Early on June 20, an area of low pressure about 760 km (470 mi), east of the Philippines began to be monitored by both the JTWC and JMA. That evening, the JTWC issued a Tropical Cyclone Formation Alert. Soon afterwards, PAGASA upgraded the system into a tropical depression, naming it as "Falcon". At the time of the upgrade, Falcon was located about 1,000 km (620 mi), east northeast of Cebu City. During the evening of June 21, the JTWC also reported that Falcon had strengthened into a tropical depression.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Meari (Falcon)
On June 22, both the JTWC and the JMA upgraded Falcon into a tropical storm, and the JMA named it Meari. Meari left the Philippines with 2 deaths and 5 people missing. On the afternoon on June 24, the JMA upgraded Meari to a severe tropical storm as it passed Okinawa, Japan.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Meari (Falcon)
On June 26, Meari rapidly moved to the Yellow Sea but slowly passed Weihai, Shandong, China, and then the JMA downgraded Meari to a tropical storm on the same day. On June 27, the JTWC downgraded Meari to a tropical depression before it made landfall on North Korea, and the JMA reported that Meari became a low-pressure area later.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Meari (Falcon)
Heavy rains from the storm's outer bands triggered significant flooding and landslides in South Korea. At least nine people were killed and three others were reported missing across the country. In North Korea, heavy rains from the storm caused widespread flooding and damage. At least 160 homes were destroyed and 50,000 hectares of crops submerged. Several reports of confirmed fatalities arose but no details on how many were given to news agencies.


2011 Pacific typhoon season, Systems, Tropical Depression Goring
Late on July 8, an area of low pressure formed about 300 km (190 mi) east of Aurora. The center was 460 km (290 mi) north of Basco, Batanes. On the morning of July 9, JMA upgraded the system to a tropical depression. It was located 450 km (280 mi) northeast of Cagayan. In the afternoon, PAGASA upgraded the low-pressure area into a tropical depression and named it Goring. After making landfall on Fujian, China, it dissipated on the evening on July 10. However, the JMA classified the system as a tropical depression until the evening of July 10.


2011 Pacific typhoon season, Systems, Typhoon Ma-on (Ineng)
An area of convection spawned a small area of low pressure on the morning of July 9. It became a tropical disturbance as it passed over the warm waters of the Pacific Ocean. On July 11, both the JMA and JTWC upgraded the tropical disturbance to a tropical depression which was located near Minamitorishima. On July 12, both the JMA and JTWC upgraded the system to a tropical storm and named it Ma-on. Early on July 13, the JMA upgraded Ma-on to a severe tropical storm and later that day strengthened into a typhoon. After absorbing Tokage, Ma-on reached its peak intensity on July 16. The PAGASA named it Ineng on July 17.


2011 Pacific typhoon season, Systems, Typhoon Ma-on (Ineng)
While Ma-on was affecting Japan, the JTWC downgraded it to a tropical storm in the evening on July 19, before making landfall on Tokushima later in the day. The JMA downgraded Ma-on to a severe tropical storm after it made landfall in Wakayama early on July 20. The JTWC downgraded Ma-on to a tropical depression on July 21, and discontinued advisories the following day. The JMA downgraded Ma-on to a tropical storm early on July 23 and transitioned into an extratropical cyclone east of the Tōhoku region the next day.


2011 Pacific typhoon season, Systems, Tropical Storm Tokage (Hanna)
On July 11, the JTWC started to monitor a tropical disturbance that had developed within a poorly organized monsoon trough about 1,000 kilometers (620 mi) to the northwest of Hagatna, Guam. Over the next couple of days, the disturbance moved towards the west and despite the system being in an area of low vertical wind shear, deep convection surrounding the system struggled to organize around the disturbances low level circulation center. However, by 06:00 UTC on July 13, it had organized enough for the JMA to declare the disturbance a tropical depression.


2011 Pacific typhoon season, Systems, Tropical Storm Tokage (Hanna)
Over the next two days, the system continued to move towards the west and gradually consolidated further. The JMA then named the system as Tokage, as it had developed into a tropical storm and reached its 10-minute peak wind speeds of 65 km/h (40 mph). PAGASA then initiated advisories on the system and named it Hanna, before the JTWC designated the system as Tropical Depression 09W and initiated advisories on the system, while it was at its 1-minute peak wind speeds of 55 km/h (35 mph).


2011 Pacific typhoon season, Systems, Tropical Storm Tokage (Hanna)
However, by this time Tokage was already interacting with Typhoon Ma-on, with Ma-on's outflow exposing Tokage's low level circulation center, and displacing convection to the west. The JMA, PAGASA and the JTWC then issued their final advisories on the system later that day as the remnants of Tokage was absorbed into Ma-on, due to the Fujiwhara effect late on July 15.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Nock-ten (Juaning)
Early on July 22, an area of low pressure formed to the east of Philippines. The system gradually drifted west over the next few days and late on July 24, the JTWC started monitoring the system as a Tropical Depression. Early the next day, the JMA upgraded the area of low pressure into a Tropical Depression. A few hours later, the PAGASA started monitoring the tropical depression and named it 'Juaning'. The system continued to drift westwards and strengthened rapidly, that on midnight, that day, the JMA further upgraded the system into a Tropical Storm, naming it Nock-Ten.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Nock-ten (Juaning)
Early on July 27, the JMA reported that Nock-ten continued to strengthen and upgraded it into a Severe Tropical Storm. A few hours later, the JTWC reported that Nock-ten rapidly intensified to a category 1 typhoon and made its landfall over northern Aurora (province) and started weakening. Later the same day, the JMA reported that Nock-ten has exited the Luzon island at Candon maintaining severe tropical storm strength. However, overnight, the storm rapidly weakened and the JMA downgraded it into a minor tropical storm the next day.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Nock-ten (Juaning)
However, on July 29, the storm gradually regained strength and approached south China coast at Qionghai, China. Later that day, the storm strengthened over land and headed north towards Hainan's provincial capital region Haikou. Over the next day, the storm drifted to the west and made landfall over Northern Vietnam. The storm weakened rapidly and at midnight that day, the JMA, issuing their final warning on the system, downgraded it into a tropical low.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Nock-ten (Juaning)
The provinces of Albay and Camarines were reported to be completely flooded by the rain. Minor damage to rice crops was reported. Additional heavy rain was expected throughout the day while Nock-ten moved into the South China Sea. The number of missing was also pushed up to 31 after 25 crewmembers of a fishing boat were reported missing when their fishing boat was caught in the storm off Masbate. Nock-ten suspended all classes in Luzon from pre-school to college levels on July 26 and 27. In Northern Luzon, Nock-ten poured down heavy rainfall becoming widespread flooding in the area. The national roads were impassable and landslides were also reported. About 26 domestic flights were cancelled from July 26 to 27 due to heavy rains and strong winds.


2011 Pacific typhoon season, Systems, Typhoon Muifa (Kabayan)
Late on July 23, an area of low pressure formed to the southeast of Chuuk. the system gradually drifted to the west and on July 25, the JTWC upgraded the low-pressure area to a tropical depression. At that time, it was located approximately 505 nautical miles (935 km; 581 mi) to the west of Guam. At midnight, that day, the JMA started monitoring the system as a tropical depression. Early on July 28, the JTWC upgraded the system into a Tropical Storm. A few hours later, the JMA too upgraded the system to a tropical storm, naming it Muifa.


2011 Pacific typhoon season, Systems, Typhoon Muifa (Kabayan)
Soon, the storm moved into the Philippine area of responsibility and the PAGASA named it Kabayan. The storm gradually drifted north over the next day maintaining strength. On the night of July 29, Muifa was upgraded into a severe tropical storm. Overnight, the storm strengthened rapidly and was upgraded into a typhoon the next morning. The storm strengthened so rapidly, and the JTWC reported that the storm's peak winds were reaching 140 knots (260 km/h; 160 mph) (1-min sustained), as it strengthened into a Category 5 Typhoon. However, the typhoon couldn't maintain Category 5 strength for a long time.


2011 Pacific typhoon season, Systems, Typhoon Muifa (Kabayan)
According to the JTWC, On July 31, the typhoon interacted with an upper-level trough and weakened into a Category 4 typhoon. The system gradually moved north, then turned west and drifted towards Okinawa, before turning northwest again, when it was finally downgraded to a tropical storm by the JTWC. Soon afterwards, the JMA too downgraded Muifa to a Severe Tropical storm. After weakening to a tropical storm, Muifa made landfall at the estuary of the Yalu River on August 8, and the JTWC issued the final warning. Early on August 9, Muifa weakened to a tropical depression over northeast China and became a low-pressure area later.


2011 Pacific typhoon season, Systems, Typhoon Muifa (Kabayan)
Muifa killed 2 men, as their boat was capsized in the vicinity of Hagonoy, Bulacan and Pampanga Delta. Due to the southwest monsoon enhanced by Muifa, it caused heavy rains in several parts of Luzon including Metro Manila. Early on August 2, the Malacañan Palace suspended government offices and pre-school to college level in NCR. Nearby provinces like Calabarzon (Region IV-A) also suspended their classes. In Marikina, 200 residents or 31 families living in communities along the Marikina River sought shelter in evacuation centers.


2011 Pacific typhoon season, Systems, Tropical Depression Lando
On July 31, the JMA reported that a tropical depression had developed about 500 km (315 mi) to the north west of Manila in the Philippines. However, because of the outflow from Typhoon Mufia, the deep convection that surrounded the system was being sheared off to the west of the systems low level circulation center. During that day the depression moved towards the north slowly, before PAGASA named it as Lando, however during the next day they reported that the depression had weakened into a low-pressure area and released their final advisory on it. After PAGASA issued their final advisory, the JMA continued to monitor the depression for another 24 hours before late on August 2, the JMA dropped the system from their advisories as it dissipated.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Merbok
Early on August 2, the JMA upgraded an area of low pressure near Wake Island to a tropical depression. The system intensified rapidly and just six hours later, the JMA upgraded the system to a tropical storm, naming it Merbok. Soon, the JTWC started monitoring the system as a tropical depression and upgraded it to a tropical storm later. Merbok began to move westward slowly, but soon afterwards, it turned northwest and gradually drifted in that direction. Late on August 5, the JMA upgraded Merbok into a severe tropical storm.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Merbok
Early on August 6, the JTWC upgraded Merbok into a Category 1 typhoon 960 mi (1,540 km) east-southeast of Tokyo, Japan. Early the next day, the storm's winds reached a peak of 90 mph (140 km/h) (1-min sustained). Later that day, the system was caught in moderate vertical wind shear and started weakening. On August 8, the system started accelerating northwards at a speed of 23 mph (37 km/h) and convection gradually diminished due to colder sea surface temperatures and unfavorable conditions. As a result, the JMA reported that Merbok had weakened into a tropical storm.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Merbok
Later on that day, the system started showing extratropical characteristics as the convection near the eye dissipated rapidly. Thus, the JTWC issued their final warning on the system reporting that the system was no longer tropical. Later, the JMA, also noting that Merbok had lost its tropical characteristics, issued their final advisory.


2011 Pacific typhoon season, Systems, Tropical Depression 13W
A tropical depression gradually drifted north and early on August 10, the JTWC started monitoring the system as a tropical depression and designated it 13W. Initially, the JMA predicted the system to strengthen into a tropical storm, but on August 11, as it moved further north into cool waters and unfavourable conditions, the JMA issued their final advisory. Later, the JTWC too issued their final warning on the system, reporting that it had moved into a subtropical ridge and was expected to dissipate into a remnant low. However, the JMA continued to track the remnants as a weak tropical depression over the next few days until the system dissipated on August 15.


2011 Pacific typhoon season, Systems, Typhoon Nanmadol (Mina)
Late on August 19, an area of low pressure developed north of Palau. Early on August 20, the system became better organized and developed a low-level circulation center (LLCC). The system then turned north and continued to drift north until August 21, when the JMA upgraded the low-pressure area to a tropical depression east of Philippines. The JTWC also issued a Tropical Cyclone Formation Alert (TCFA), reporting that the system was becoming better organized. Later that day, the PAGASA started monitoring the system as a tropical depression and named it Mina.


2011 Pacific typhoon season, Systems, Typhoon Nanmadol (Mina)
Late on August 22, the system became more well organized prompting the JTWC to initiate advisories on the system, designating it 14W. On August 23, the JMA upgraded 14W to a tropical storm, naming it Nanmadol. Overnight, the system continued to intensify and early on August 24, the JMA upgraded Nanmadol to a severe tropical storm. Later that day, convective banding improved and Nanmadol developed an eye-like feature. As a result, Nanmadol continued to intensify rapidly and became a typhoon, by midnight.


2011 Pacific typhoon season, Systems, Typhoon Nanmadol (Mina)
Nanmadol continued to drift north east and made landfall over Gonzaga, Cagayan, Philippines with strong winds of over 110 mph (180 km/h). Nanmadol weakened significantly after interacting with land and early on August 28, the JMA downgraded Nanmadol to a severe tropical storm. Late on August 28, Nanmadol made its second landfall over Taimali in the Taitung County of Taiwan and started weakening. Landfall weakened the system rapidly prompting the JMA to downgrade Nanmadol to a tropical storm with winds of under 50 mph (80 km/h). Soon, it started experiencing strong wind shear and continued weakening.


2011 Pacific typhoon season, Systems, Typhoon Nanmadol (Mina)
The shear pushed convection approximately 70 km (43 mi) south of the LLCC. The system also accelerated towards China at 8 knots (15 km/h; 9.2 mph) and weakened to a minimal tropical storm. After its third landfall over Fujian, Nanmadol weakened rapidly prompting both the JTWC and the JMA to issue their final warnings on the system.


2011 Pacific typhoon season, Systems, Typhoon Nanmadol (Mina)
On August 27, five people died after Nanmadol caused landslides. At least two Filipino fishermen were reported to be missing after Nanmadol's strong winds whipped up large waves. In September 2011, the JTWC upgraded Nanmadol to a Category 5 super typhoon in post-analysis.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Talas
Late on August 21, a low-pressure area developed to the west of Guam, which is associated from the remnants of a tropical depression. At midnight that day, the system became sufficiently well organized that the JMA started tracking it as a tropical depression. On August 23, the system moved into an environment of low wind shear and warm sea surface temperatures prompting the JTWC to issue a TCFA on it. By August 25, the system grew strong enough that the JMA upgraded it to a tropical storm, naming it Talas.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Talas
Later that day, the JTWC followed suit and initiated advisories on Talas. Talas continued to strengthen and by midnight that day, it became a severe tropical storm. Over the next few days, Talas continued to drift north very slowly until late on August 29, when the JMA upgraded Talas to a typhoon. Soon, a subtropical ridge to the west of the storm weakened and the subtropical ridge to the east of the system pushed Talas to the west. As a result, Talas accelerated towards the west maintaining strength and outflow.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Talas
An upper-level cyclone over the system suppressed the convection and kept it from reaching the center. Therefore, Talas remained weak and did not strengthen further. Convection never managed to consolidate the center and convective banding remained well away from the fully exposed low-level circulation center. The convective banding continued to expand more and more with the outer rainbands already brushing parts of Japan. Coastal areas in the nation have already reported gale-force winds several hours before landfall, while the Omega block continued to drive Talas towards the nation.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Talas
Land interaction weakened Talas, prompting the JMA to downgrade Talas from a typhoon to a severe tropical storm with winds of under 60 knots (110 km/h; 69 mph). Early on September 3, Talas made landfall over Aki, Japan. After landfall, Talas accelerated north at over 13 knots (24 km/h; 15 mph) and its central convection became significantly eroded and was displaced to the north-east as Talas was exposed to a very strong wind shear of over 50 knots (93 km/h; 58 mph) that made the LLCC very distorted and difficult to pin-point. Talas was embedded in a baroclinic zone and the JTWC anticipated an extratropical transition, which prompted them to issue their final warning on the system. On September 5, the JMA issued their final warning on the system, reporting that Talas has become extratropical on the Sea of Japan.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Talas
In October 2011, the JMA upgraded Talas as a typhoon in post-analysis. But during 2014, the JMA downgraded Talas again to a severe tropical storm on another post-analysis.


2011 Pacific typhoon season, Systems, Tropical Storm Noru
During September 1, the JTWC reported that a tropical disturbance had developed within the outflow of Tropical Storm Talas, about 980 km (610 mi) to the northeast of Hagåtña, Guam. Deep convection surrounded the systems low-level circulation but it was not organising as it was impacted, by a moderate to strong amount of vertical wind shear, which was produced by Talas' outflow and a TUTT cell to the northeast of the system.


2011 Pacific typhoon season, Systems, Tropical Storm Noru
However, during that day vertical wind shear surrounding the system relaxed and the system started to consolidate, while it moved towards the north-northwest around a subtropical ridge of high pressure. Early the next day, because the system continued to consolidate the JTWC issued a Tropical Cyclone Formation Alert, while the JMA reported that the system had become a tropical depression.


2011 Pacific typhoon season, Systems, Tropical Storm Noru
Over the next 24 hours, the system continued to consolidate as it moved towards the north-northwest before the JTWC initiated advisories on the system as it intensified into Tropical Storm 16W, however the JMA did not name it as Noru until 0600 UTC on September 4,. As it was named, the JTWC reported that Noru had peaked with 1-minute windspeeds of 85 km/h (55 mph), while the JMA reported peak 10-minute sustained wind speeds of 75 km/h (45 mph).


2011 Pacific typhoon season, Systems, Tropical Storm Noru
On September 5, after it had peaked in intensity, a fresh Tutt cell developed over the system and started to inhibit outflow and shear the convection away, which meant as a result that the system started to weaken. Over the next two days, Noru went through an extratropical transition before becoming an extratropical cyclone on September 6, about 1150 km (715 mi) to the northeast of Tokyo, Japan. As an extratropical cyclone, Noru continued its movement towards the north-northwest and affected Sakhalin and the Kuril Islands, before it moved over Okhotsk on September 9, and dissipated.


2011 Pacific typhoon season, Systems, Tropical Storm Kulap (Nonoy)
Late on September 4, an area of low pressure developed to the southeast of Okinawa, Japan. Over the next two days, the system drifted north and developed a well defined LLCC with organized convective banding, prompting the JMA to upgrade the low-pressure area to a tropical depression. On September 7, convection consolidated the low-level circulation center very well with tightly curved banding wrapped into it. Also, high sea-surface temperatures and very low wind shear caused the system to undergo rapid deepening, prior to which, the JMA upgraded the system to a tropical storm and named it Kulap.


2011 Pacific typhoon season, Systems, Tropical Storm Kulap (Nonoy)
However, the system stopped strengthening soon after as the LLCC became partially exposed and the convection was displaced to the south. Kulap remained small in size and dry air entering from the western periphery kept it from strengthening further. Wind shear increased, pushing convection approximately 180 nautical miles (330 km; 210 mi) south of the LLCC. Also, Kulap was located beneath a tropical upper tropospheric trough (TUTT cell) that caused subsidence. A mid-level subtropical steering ridge caused Kulap to track in a northwestward direction.


2011 Pacific typhoon season, Systems, Tropical Storm Kulap (Nonoy)
On September 8, Kulap moved into the east-northeast periphery of the Philippine Area of Responsibility (PAR) prompting the PAGASA to start issuing advisories on the system, naming it Nonoy. However, Kulap quickly accelerated north and exited the PAR on the same evening, prompting the PAGASA to issued their final advisory on the system. After increasing wind shear caused further weakening, the JTWC downgraded Kulap to a tropical depression late on September 8,. Early on September 10, the JMA too downgraded Kulap to a tropical depression, and continued to track Kulap's remnants as a tropical depression until it was finally absorbed by the weather front early on September 11.


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
Early on September 8, a cluster of thunderstorms came together as a low-pressure area with improving outflow and a developing low-level circulation center (LLCC). Later that day, the JMA upgraded the low-pressure area to a tropical depression north-northeast of the Northern Mariana Islands. Over the next two days, the system gradually drifted west and intensified slightly, prompting the JTWC to issue a Tropical Cyclone Formation Alert (TCFA) on it.


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
Convection gradually consolidated the LLCC and the JTWC initiated advisories on the system on September 11, designating it with 18W. The next day, the depression drifted into the Philippine Area of Responsibility (PAR) and the PAGASA initiated advisories on the depression, naming it Onyok. However, just as similar to Kulap, Onyok also exited the PAR in 6 hours from entering the region. In an advisory, the JTWC reported that there were at least two more vortices associated with the system, that caused an abrupt, erratic movement.


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
However, being located in an area of warm sea surface temperatures and low vertical wind shear, the depression continued to strengthen and on September 13, the JMA upgraded the depression to a tropical storm and named it Roke. On September 17, Roke developed a small, deep convective eye promoting the JMA to upgrade Roke to a severe tropical storm with winds of over 50 knots (93 km/h; 58 mph).


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
Between September 19 and 20, Roke underwent Explosive intensification, a more extreme case of rapid deepening that involves a tropical cyclone deepening at a rate of at least 2.5 mbar per hour for a minimum of 12 hours. Also, they added that Roke developed a 10 nautical miles (19 km; 12 mi) eye and a good poleward outflow channel. On September 21, Typhoon Roke made landfall over Hamamatsu, Japan at about 5:00 UTC (14:00 JST). Soon Roke started weakening as cloud tops started getting warmed up and eye diameter started to decrease.


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
However, the system still maintained a near radial outflow and the convective structure continued to remain organized that kept Roke from dissipating rapidly. Although Roke entered a de-intensification phase, it still had plenty of strength that posed a great threat to regions of Japan. Being located approximately 330 nautical miles (610 km; 380 mi) southwest of Yokosuka, the typhoon accelerated north-northwestward at approximately 16 knots (30 km/h; 18 mph) with winds of over 100 knots (190 km/h; 120 mph) (1-min sustained) being a Category 3 typhoon on the SSHS. Being embedded in the baroclinic zone, Roke started its extratropical transition.


2011 Pacific typhoon season, Systems, Typhoon Roke (Onyok)
Also, land interaction severely weakened the storm to a minimal Category 1 typhoon with winds of under 70 knots (130 km/h; 81 mph) (1-min sustained). Only six hours later, the storm further weakened and accelerated northeastward at approximately 31 knots (57 km/h; 36 mph) with rapidly dissipating deep convection completely sheared to the northeast of the LLCC. As a result, the JTWC ceased advisories on the storm, as it became fully extratropical.


2011 Pacific typhoon season, Systems, Typhoon Sonca
Early on September 13, a low-pressure area formed northeast of the Northern Mariana Islands. The system gradually drifted north and steadily intensified until the next day when the JMA upgraded the system to a tropical depression. Later on September 14, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) on the system reporting that the system could intensify into a tropical storm within 24 hours from then.


2011 Pacific typhoon season, Systems, Typhoon Sonca
Convection rapidly consolidated the center with persistent, deep convection around the north-eastern periphery, prompting the JTWC to initiate advisories on the system, designating it with 19W. Soon, the JMA also initiated advisories on the system, upgrading it to Tropical Storm Sonca. In the begging, Sonca seemed to have intensified rapidly since formation, however, soon the storm weakened back to a minimal tropical storm because of dry air entering the LLCC that caused it to elongate and weaken.


2011 Pacific typhoon season, Systems, Typhoon Sonca
However, that was not for too long as vigorous convection persisted over the well defined LLCC with tightly curved banding wrapped in, Sonca continued to strengthen gradually and the JTWC reported winds of at least 50 knots (93 km/h; 58 mph) near the center. As Sonca continued to strengthen, and the JMA upgraded it to a severe tropical storm on September 17,. Later that day, Sonca developed a large 10 nautical miles (19 km; 12 mi) ragged eye with deep convective banding tightly wrapped into it.


2011 Pacific typhoon season, Systems, Typhoon Sonca
As a result, Sonca strengthened more rapidly and by early the next day, it became a typhoon. On September 19, Sonca reached a peak intensity of 85 knots (157 km/h; 98 mph) (1-min mean) and 70 knots (130 km/h; 81 mph) (10-min mean) and soon the convection around the northern periphery started weakening. Being embedded in a baroclinic zone with low sea surface temperatures, Sonca started its extratropical transition late on September 19.


2011 Pacific typhoon season, Systems, Typhoon Sonca
The transition took place relatively fast because of a frontal boundary and the JTWC reported that Sonca became extratropical early on September 20, while the JMA did the same later in the evening.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
On September 23, both the JMA and the JTWC reported that Tropical Depression 20W, had developed about 610 km (380 mi) to the southwest of Hagåtña, Guam. Early on September 24, the JMA further upgraded 20W to a tropical storm and named it Nesat. Nesat continued to drift west with expanding deep convection around the entire system and consolidating convection around the LLCC. The mid-level warm anomaly near the system continued to intensify and convective banding near the LLCC became more and more tighter. As a result, the JMA upgraded Nesat to a severe tropical storm on September 25,.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
Late on the same day, the JMA further upgraded Nesat to a typhoon. The system rapidly deepened and quickly developed a 30 nautical miles (56 km; 35 mi) ragged eye and mesoscale anticyclone aloft generating an exceptionally excellent all-around outflow. Also, the system had a highly symmetric radial outflow. The JTWC originally anticipated Nesat to become a category 4 typhoon on the SSHS with winds exceeding 130 knots (240 km/h; 150 mph) (1-min sustained). However, because of a cold anomaly, the system only reached a maximum 1-min sustained wind speed of 115 knots (213 km/h; 132 mph).


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
Early on September 27, Nesat made landfall over the Luzon region of Philippines. As a result, the eyewall got eroded and the maximum 1-min sustained winds dropped to 95 knots (176 km/h; 109 mph). The system approached land at nearly 10 knots (19 km/h; 12 mph). However, later on that day, the LLCC started to get re-consolidated with convection as Nesat quickly moved west and re-emerged over water.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
At that time, it was located near the southern periphery of a deep layered subtropical steering ridge and moved towards the southwest and the winds further dropped to 85 knots (157 km/h; 98 mph) because of land interaction. Though the system has maintained overall central deep convection, subsidence persisted along the northwest quadrant which caused further drop in wind speed. Upper level analysis indicated that Nesat was to the south of a ridge axis in an area of moderate vertical wind shear. The system continued to weaken with convective banding loosely wrapped into the partially exposed LLCC.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
The winds continued to drop and eventually reached 65 knots (120 km/h; 75 mph) (1-min sustained) which made it a minimal typhoon on the SSHS. Though the weakening, Water vapour imagery showed that the typhoon was still maintaining excellent outflow towards the equator and improving outflow towards the pole. Nesat maintained a relatively large area of gale-force winds. Animated infrared satellite imagery depicted that the storm was expanding in size and convective banding continued to move further and further away from the LLCC. The LLCC was also relatively large, elongated and cloud free.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
On September 29, by the time Nesat managed to re-develop ad 10 nautical miles (19 km; 12 mi) ragged eye, it made landfall over Wenchang in Hainan, China and started weakening again. Because of the poor shapre and disorganization at the LLCC, the typhoon could only maintain a maximum 1-min sustained windspeed of 65 knots (120 km/h; 75 mph). Even after the landfall, Nesat maintained vigorous convection all around the LLCC and did not weaken too much when compared to the reactions after the Philippine landfall.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
There was a sea-surface temperature of approximately 28 °C (82 °F) and a slight vertical wind shear of 10 knots (19 km/h; 12 mph) near the system's center at that time. The JTWC anticipated the storm to gradually drift over the Gulf of Tonkin and make landfall over Vietnam with a 1-min sustained wind speed of at-least 50 knots (93 km/h; 58 mph). Early on September 30, Nesat made its final landfall over northern Vietnam with a 1-mim sustained windspeed of 55 knots (102 km/h; 63 mph) and a well-defined, tightly wrapped LLCC, and soon it started weakening. Due to land interaction, the convection around the system started decaying rapidly. Due to the rapid weakening, the JTWC ceased advisories on the storm, soon afterwards. Later that evening, the JMA downgraded Nesat to a tropical low over land and issued their final warning on the system.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
The residents of Manila had nothing to do but wading through waist-deep floodwaters, dodging branches and flying debris as the typhoon sent surging waves as tall as palm trees over seawalls completely submerging neighborhoods. By the evening of September 27, at-least 7 people were reported to be killed and most of them in metropolitan Manila, a place already battered by heavy monsoonal rains. Similar to the Tulane University during Hurricane Katrina, the Manila Hospital moved patients from its ground floor which was flooded with neck-deep waters. Hospital generators were flooded and the building had no power since the typhoon arrived.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
Soldiers and police in trucks moved thousands of residents, most importantly the women and the children away from the Baseco shanty after many houses were washed away in the storm surge and floodwaters brought by Nesat. The typhoon made landfall before dawn triggering instant response. Authorities ordered more than a hundred thousand people across the country to flee from Typhoon Nesat's rains and wind gusts. Several schools and offices were shut and thousands were stranded after flight and ferry services were completely disrupted by the fierce storm. Nearly thirty-seven percent of Manila Electric Company's service area was left without power after high winds and heavy rains toppled power lines. Also, in Malabon, Navotas and Valenzuela the Manila Electric power company shut down power to prevent any accidents.


2011 Pacific typhoon season, Systems, Typhoon Nesat (Pedring)
During late 2011, the JTWC instead upgraded Nesat from a category 3 to a category 4 typhoon as a post-analysis.


2011 Pacific typhoon season, Systems, Tropical Storm Haitang
On the evening of September 21, at almost the same time when Nesat was first seen, another low-pressure area persisted far south of Hong Kong. The low slowly drifted north and strengthened slowly until September 24, when the JMA upgraded the system to a tropical depression east of Vietnam. Later that day, the JTWC issued a Tropical Cyclone Formation Alert stating that the low could develop into a tropical cyclone. Only a few hours later, the JTWC initiated advisories on the system, designating it with 21W.


2011 Pacific typhoon season, Systems, Tropical Storm Haitang
Early the next day, the storm strengthened significantly that the JMA upgraded it to a tropical storm, naming it Haitang. Later that day, the storm developed a better organized; however, the system's low-level circulation center (LLCC) became fully exposed due to moderate vertical wind shear from the nearby system, Typhoon Nesat, which also caused the storm to remain very weak with winds of 35 knots (65 km/h; 40 mph). By that night, wind shear from Nesat, which was moving closer towards Haitang, strengthened and pushed all the convection to the west-southwest keeping the storm relatively weak.


2011 Pacific typhoon season, Systems, Tropical Storm Haitang
Though a ridge building over China impinged poleward outflow, the euquatoward outflow remained significantly excellent. Haitang was also a slow-mover, moving westward at only 3 knots (5.6 km/h; 3.5 mph). However, by the night of September 26, Haitang rapidly accelerated west at over 13 knots (24 km/h; 15 mph) and made landfall over Vietnam. Though there was a burst of convection at that time, both land interaction and vertical wind shear weakened the system into a tropical depression and the JTWC ceased their advisories. The JMA tracked Haitang as a tropical depression until it finally dissipated inland Vietnam early on September 27,.


2011 Pacific typhoon season, Systems, Typhoon Nalgae (Quiel)
On September 26, the Japan Meteorological Agency (JMA) started to monitor a weak tropical depression that had developed about 1,260 km (785 mi) to the northwest of Manila in the Philippines. During that day, while the depression moved towards the northwest its low level circulation centre rapidly consolidated in an area of favourable conditions for further development of the system. This prompted the JTWC to issue a Tropical Cyclone Formation Alert on the system early the next day. However less than 3 hours later, the JTWC decided to issue advisories on the system designating it as Tropical Depression 22W, before the JMA reported that the depression had become a tropical storm and named it Nalgae.


2011 Pacific typhoon season, Systems, Typhoon Nalgae (Quiel)
The storm slowly drifted to the west and kept on intensifying gradually. Nalgae developed a microwave eye like feature and well defined convective banding in all the quadrants. The system had a tiny radius of winds, though it was still strengthening significantly and was very well defined. On the evening of September 28, the JMA reported that Nalgae continued to intensify, as they upgraded it to a severe tropical storm with winds of over 55 knots (102 km/h; 63 mph).


2011 Pacific typhoon season, Systems, Typhoon Nalgae (Quiel)
On that night, the PAGASA initiated advisories on Nalgae, giving it the local name Quiel, as it entered the Philippine Area of Responsibility (PAR). Late on September 29, the JMA upgraded Nalgae to a typhoon. Nalgae rapidly intensified on September 30, and attained category 4 super typhoon status early on October 1, just before making landfall over Luzon. Due to land interaction and colder sea surface temperature in the South China Sea, the JMA downgraded Nalgae to a severe tropical storm on October 2, and then a tropical storm late on October 3. The JTWC downgraded Nalgae to a tropical depression on October 4, and the JMA also did it on the next day. Later on October 5, the remnant low of Nalgae dissipated.


2011 Pacific typhoon season, Systems, Typhoon Nalgae (Quiel)
Striking the Philippines just days after Typhoon Nesat, Nalgae caused further damage across Luzon. Although first feared that Nalgae would cause much more damage to Luzon, which was severely affected by Typhoon Nesat, damage from the storm was not as anticipated to be lighter than Typhoon Nesat, which ironically is much weaker than Nalgae, but high winds and heavy rains from the storm caused widespread power outages and flooding that left many communities isolated. Nearly 2,900 homes were destroyed and approximately another 15,400 sustained damage. At least 18 people were killed by the storm and another 7 were reported as missing as of October 11. A total of 1,113,763 people were affected by the storm. Total losses in the country reached just over 115 million PHP (US$2.62 million).


2011 Pacific typhoon season, Systems, Tropical Storm Banyan (Ramon)
On October 7, the JTWC started monitoring a tropical disturbance that had developed in an area of low vertical windshear, about 750 km (465 mi) to the south of Hagåtña, Guam. Over the next couple of days the system gradually developed further while moving towards the west, before the JMA reported on October 9, that the disturbance had developed into a tropical depression. Early on October 10, the JTWC upgraded the system to a tropical depression designating as 23W, and the PAGASA also upgraded it to a tropical depression and named it Ramon.


2011 Pacific typhoon season, Systems, Tropical Storm Banyan (Ramon)
On October 11, the JMA and the JTWC upgraded the system to a tropical storm and named it Banyan. Early on October 12, Banyan made landfall over Leyte, Philippines, and the JTWC downgraded it to a tropical depression. A half day later, the JMA also downgraded Banyan to a tropical depression. The system dissipated in the South China Sea, on October 16,.


2011 Pacific typhoon season, Systems, Tropical Storm Banyan (Ramon)
While tracking through the Philippines, Banyan produced heavy rains across much of the country, leading to widespread flooding. At least ten people were killed by the storm and another was reported missing. A total of 75,632 people were affected by the storm.


2011 Pacific typhoon season, Systems, Tropical Depression 24W
On November 5, the JTWC started to monitor a tropical disturbance that had developed within an area of low vertical windshear, about 640 km (400 mi) to the east-southeast of Ho Chi Minh City in Vietnam. Over the next couple of days the disturbance moved towards the north-northwest as atmospheric convection surrounding the system wrapped into the disturbances developing low-level circulation center. During November 7, the JMA and the JTWC reported that the disturbance had become a tropical depression and started to warn on it with the latter designating it as Tropical Depression 24W.


2011 Pacific typhoon season, Systems, Tropical Depression 25W
During December 3, the JTWC started to monitor a tropical disturbance, that had developed within an area of moderate vertical windshear, about 180 km (110 mi) to the northwest of Bandar Seri Begawan, Brunei. During that day deep atmospheric convection surrounding the system built over the disturbances low level circulation, before the JTWC reported during the next day, that the disturbance had developed into a tropical cyclone and designated it as Tropical Depression 25W. Despite being predicted to intensify into a tropical storm after being designated, the depression moved towards the northwest and rapidly deteriorated as it interacted with the cold and dry north-easterlies, as a result the JTWC issued their final warning on the system early on December 5.


2011 Pacific typhoon season, Systems, Tropical Depression 26W
On December 9, the JTWC started to monitor a tropical disturbance that had developed about 550 km (340 mi) to the south-southeast of Manila on Luzon Island. On December 11, the JTWC cancelled the TCFA on the disturbance due to the interaction with the cold air coming from the north. The tropical depression reached peak intensity during midday, on December 11, as it was located over the center, of the South China Sea. But later that day, the depression began to weaken rapidly, as the storm moved southeastward.


2011 Pacific typhoon season, Systems, Tropical Depression 26W
However, the JTWC issued a TCFA on the disturbance again early on December 12, because of a decrease in vertical wind shear. After a few hours, the JTWC upgraded it to a tropical depression and designated as 26W. After a couple of days drifting southwestwards in the South China Sea, on December 13, the JTWC issued their final advisories on the system as it started to weaken. Late on December 14, the tropical depression dissipated near Borneo.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Washi (Sendong)
On December 11, a disturbance formed and persisted near Chuuk. On December 13, the low-pressure area rapidly intensified prompting the JTWC to issue a TCFA. On the same day, the JTWC upgraded the low pressure to a tropical depression and designated as 27W; in addition, the JMA also upgraded it to a tropical depression. The JTWC upgraded the system to a tropical storm on December 14, but downgraded it to a tropical depression early on December 15, and the PAGASA designated it Sendong as it entered the Philippine Area of Responsibility.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Washi (Sendong)
After passing Palau on December 15, both the JTWC and the JMA upgraded the system to a tropical storm and named it Washi. On December 16, Washi made landfall over Surigao del Sur, a province of the Philippines located in Mindanao. Several hours later, Washi arrived at the Sulu Sea and regained its strength quickly, due to slight land interaction with Mindanao. Late on December 17, Washi crossed Palawan, and arrived at the South China Sea. On December 19, Washi weakened into a tropical depression and dissipated.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Washi (Sendong)
In the Philippines, Washi has caused at least 1,268 fatalities, and 1,079 people are officially listed as missing. Washi had affected 102,899 families or 674,472 people in 766 villages in 52 towns and eight cities in 13 provinces. The majority of the deaths were in the cities of Iligan and Cagayan de Oro. Five people were killed in a landslide, but all others died in flash flooding. More than 2,000 have been rescued, according to the Armed Forces of the Philippines. Officials were also investigating reports that an entire village was swept away.


2011 Pacific typhoon season, Systems, Severe Tropical Storm Washi (Sendong)
The flash flooding occurred overnight, following 10 hours of rain, compounded by overflowing rivers and tributaries. In some areas, up to 20 centimeters of rain fell in 24 hours. At least 20,000 people were staying in 10 evacuation centers in Cagayan de Oro. Officials said that despite government warning, some people did not evacuate. At least 9,433 houses were destroyed while 18,616 were damaged.


2011 Pacific typhoon season, Systems, Other systems
The following weak tropical depressions were also monitored by one or more of the warning centers, however they were either short lived or did not significantly develop further. On May 31, the JMA reported that a tropical depression had developed at the southern end of a shear line, about 420 km, (260 mi) to the southeast of Hong Kong, China. During that day as the depression moved towards the north-northeast, a trough of low pressure located over Hainan island and dry cold air wrapping into the depression's circulation inhibited further development of the depression.


2011 Pacific typhoon season, Systems, Other systems
The depression then degenerated into an area of low pressure during the next day, before it dissipated during June 2,. On June 14, the JMA reported that a tropical depression had developed within an area of moderate vertical windshear, about 475 mi (764 km) to the southwest of Manila, Philippines. During that day the depression moved to the north-northwest, before the system dissipated during the next day. On July 16, the JMA reported that a tropical depression had developed about 225 km (140 mi) to the east of Hanoi in northern Vietnam, however it quickly weakened after interacting with land.


2011 Pacific typhoon season, Systems, Other systems
In the morning of July 16, the Japan Meteorological Agency located in an area of low pressure on the land was upgraded to a tropical depression later on the same day. On July 17, the JMA downgraded the tropical depression to a low pressure. The Hong Kong Observatory only classified the tropical depression as a trough of low pressure is not to be ignored, while the Joint Typhoon Warning Center nor recognize this as a tropical disturbance. On August 19, a low-pressure area developed east-northeast of Guam.


2011 Pacific typhoon season, Systems, Other systems
Early on August 20, the system developed a broad area of low level circulation center and a good divergence aloft becoming more well defined. Later that day, the JMA upgraded the system to a tropical depression southeast of the Bonin Islands. On August 22, the system started interacting with an anticyclone and was exposed to a strong vertical wind shear, prompting the JMA to stop monitoring the system as a tropical depression, as the system dissipated to a remnant low.


2011 Pacific typhoon season, Systems, Other systems
However, at midnight, the same day, the remnants regenerated, and the JMA started tracking the system as a tropical depression again, until it last appeared near Okinawa, Japan on August 25, as the system dissipated completely. On September 14, the JMA started to monitor a tropical depression that had developed about 720 km (450 mi) to the southeast of Taipei in Taiwan. During that day, the depression remained near stationary, before becoming stationary, the JMA then last noted the depression late on September 15, as it was absorbed by Typhoon Roke.


2011 Pacific typhoon season, Systems, Other systems
On October 11, the JMA reported that a tropical depression had developed to the southeast of Hainan Island. Late on October 13, the system dissipated, just after making landfall over Vietnam. On December 24, the JMA reported that a tropical depression had developed about 1,768 km (1,099 mi) to the southeast of Manila, in the Philippines. During that day, the depression moved towards the northwest before the JMA issued their final advisory on the system. The final tropical depression of the year then developed on December 31, about 340 km (210 mi) to the northeast of Kuala Lumpur, Malaysia. During that day the system moved slowly towards the northwest before it was last noted early the next day on January 1, 2012.


2011 Pacific typhoon season, Storm names
Within the North-western Pacific Ocean, both the Japan Meteorological Agency (JMA) and the Philippine Atmospheric, Geophysical and Astronomical Services Administration assign names to tropical cyclones that develop in the Western Pacific, which can result in a tropical cyclone having two names. The Japan Meteorological Agency's RSMC Tokyo — Typhoon Center assigns international names to tropical cyclones on behalf of the World Meteorological Organization's Typhoon Committee, should they be judged to have 10-minute sustained windspeeds of 65 km/h, (40 mph).


2011 Pacific typhoon season, Storm names
While the Philippine Atmospheric, Geophysical and Astronomical Services Administration assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135°E and 115°E and between 5°N-25°N even if the cyclone has had an international name assigned to it. The names of significant tropical cyclones are retired, by both PAGASA and the Typhoon Committee. Should the list of names for the Philippine region be exhausted then names will be taken from an auxiliary list of which the first ten are published each season. Unused names are marked in gray.


2011 Pacific typhoon season, Storm names, International names
During the season 21 tropical storms developed in the Western Pacific and each one was named by the JMA, when the system was judged to have 10-minute sustained windspeeds of 65 km/h (40 mph). The JMA selected the names from a list of 140 names, that had been developed by the 14 members nations and territories of the ESCAP/WMO Typhoon Committee.


2011 Pacific typhoon season, Storm names, International names
After the season the Typhoon Committee retired the name Washi from its naming lists, and in February 2012, it was subsequently replaced with Hato for future seasons.


2011 Pacific typhoon season, Storm names, Philippines
During the season PAGASA used its own naming scheme for the 19 tropical cyclones, that either developed within or moved into their self-defined area of responsibility. The names were taken from a list of names, that had been last used during 2007 and are scheduled to be used again during 2015.


2011 Pacific typhoon season, Storm names, Philippines
After the season the names Bebeng, Juaning, Mina, Pedring and Sendong were retired by PAGASA, as they had caused over 300 deaths and over Php1 billion in damages. They were subsequently replaced on the list with Betty, Jenny, Marilyn, Perla and Sarah. The name Sendong was also retired from the list after it caused over 300 deaths, when it made landfall on the Philippines during December 2011.


2011 Pacific typhoon season, Season effects
This table lists all of the tropical cyclones that were monitored during the 2011 Pacific typhoon season. Information on their intensity, duration, name, areas affected, primarily comes from the warning centres while death and damage reports come from either press reports or the relevant national disaster management agency and include any impact that was associated with the system.


2011 Pacific-10 Conference Men's Basketball Tournament
The 2011 Pacific Life Pacific-10 Conference Men's Basketball Tournament was played on March 9–11, 2011 at Staples Center in Los Angeles, California. The tournament champion became the NCAA Tournament automatic qualifier from the conference. The Arizona Wildcats, finish the season atop of the conference with a 14–4 record, and the UCLA Bruins were the two top-seed teams in the tournament. The third-seeded Washington Huskies won the tournament. This was the final tournament ever held under the "Pac-10" name, as Colorado and Utah joined the conference in July, making it the "Pac-12."


2011 Pacific-10 Conference Men's Basketball Tournament, Seeds
Teams were seeded by conference record, with a tiebreaker system used to seed teams with identical conference records.


2011 Pacific-10 Conference Men's Basketball Tournament, 2011 Hall of Honor inductees
The induction ceremony took place on Saturday, March 12, 2011, during the Pac-10 Hall of Honor breakfast:


2011 Pacific-Asia Curling Championships
The 2011 Pacific-Asia Curling Championships were held from November 19 to 26 at the Nanjing Olympic Sports Center in Nanjing, China. The Pacific Championships acted as the Pacific Zone qualifiers for the 2012 World Curling Championships. The top two women's berths (China and Korea) qualified for the 2012 Ford World Women's Curling Championship in Lethbridge, Alberta, while the top two men's berths (China and New Zealand) qualified for the 2012 Capital One World Men's Curling Championship in Basel, Switzerland.


2011 Pacific-Asia Curling Championships, Men, Teams
Third: Xu XiaomingSecond: Ba DexinLead: Chen Lu'anAlternate: Zang JialiangCoach: Lorne Hamblin


2011 Pacific-Asia Curling Championships, Men, Teams
Third: Brendon LiuSecond: Nicholas HsuLead: Justin HsuAlternate: Steve KooCoach: Greg Monkman


2011 Pacific-Asia Curling Championships, Men, Teams
Third: Yuki SawamukaiSecond: Yusaku ShibayaLead: Ryosuke HaneishiAlternate: Taichi TeramachiCoaches: Hitoshi Matsudaira, Shinya Abe


2011 Pacific-Asia Curling Championships, Men, Teams
Third: Kim Min-chanSecond: Seong Se-hyeonLead: Seo Young-seonAlternate: Oh Eun-suCoach: Kim Kyung-doo


2011 Pacific-Asia Curling Championships, Men, Teams
Third: Sean BeckerSecond: Scott BeckerLead: Kenny ThomsonAlternate: Phil DowlingCoach: Peter Becker


2011 Pacific-Asia Curling Championships, Men, Playoffs
Note: First two games of semifinals best-of-five are taken from round-robin games.


2011 Pacific-Asia Curling Championships, Women, Teams
Third: Sun YueSecond: Yue QingshuangLead: Zhou YanAlternate: Liu JinliCoach: Zhang Wei


2011 Pacific-Asia Curling Championships, Women, Teams
Third: Miyo IchikawaSecond: Emi ShimizuLead: Miyuki SatohAlternate: Chiaki MatsumuraCoaches: Hatomi Nagaoka, Shinya Abe


2011 Pacific-Asia Curling Championships, Women, Teams
Third: Lee Seul-beeSecond: Gim Un-chiLead: Lee Hyun-jungAlternate: Shin Mi-sungCoach: Choi Min-suk


2011 Pacific-Asia Curling Championships, Women, Teams
Third: Chelsea FarleySecond: Thivya JeyaranjanLead: Natalie CampbellAlternate: Tessa FarleyCoach: John Campbell


2011 Pacific-Asia Curling Championships, Women, Playoffs
Note: First two games of semifinals best-of-five are taken from round-robin games.


2011 Pakistan Rangers shooting incident
The 2011 Sindh Rangers shooting incident was a controversial incident regarding the fatal shooting of a 22-year-old Pakistani citizen Sarfaraz Shah by Sindh Division of the Pakistan Rangers.


2011 Pakistan Rangers shooting incident, Incident
Sarfaraz Shah was shot by members of the Sindh branch of the Pakistan Rangers in Karachi in 2011. The incident was recorded by a local television cameraman, Abdul Salam Somroo. After the channel he worked for, Samaa TV, refused to air the footage, Somroo had the footage broadcast on another Pakistani national channel. After the footage of the incident spread, other media companies, national and international, aired the footage as well. The cameraman left Karachi with his family after receiving numerous threats.


2011 Pakistan Rangers shooting incident, Incident
The video shows Sarfaraz Shah in a black T-shirt being dragged by his hair in a public park by a man in plain clothes. He was then pushed towards a group of uniformed Rangers disembarking from a pick-up truck, one of them approaching him aggressively, armed with G3 battle rifles. Shah, who did not appear to be armed, pleaded for his life as one of the Rangers pointed a gun at his neck. The Ranger then shot him twice at close range with the rifle and hit him in the thigh and arm. Shah can be seen writhing on the ground, screaming in pain, bleeding heavily, and begging for help as the video ends (he is not taken to hospital by the rangers). He died of blood loss.


2011 Pakistan Rangers shooting incident, Aftermath
Shortly after the incident it was not clear who made the video, which led to some reports suggesting that the cameraman had gone into hiding. The incident sparked public outcry, especially in Shah's local area, with some politicians calling for the Rangers involved to be prosecuted.


2011 Pakistan Rangers shooting incident, Aftermath
The Rangers and park employees alleged that the young man had been caught trying to rob someone, which Shah's family denies. His brother, Salik Shah, said Sarfaraz had been the victim of an extrajudicial killing, saying "My innocent brother has been killed brutally by the Rangers." and "What harm has he inflicted on anybody? His crime was that he was just strolling in the public park because there was no power in the house." A later investigation revealed that a toy gun was recovered from the victim.


2011 Pakistan Rangers shooting incident, Aftermath
The whole episode was also recorded incidentally by the crew of a Sindhi TV channel, Awaz Television Network. They were at the Benazir Shaheed Public Park, Clifton near the American Consulate in Karachi, at around 17:30 pm, recording their program "Walk & Talk". Someone claimed to be a security guard at the park and brought Shah to the Rangers who drove a white-coloured vehicle numbered 1543. The Rangers appeared to be 'hyper', and their physical and mental condition could not be ascertained by an independent medical examination, as they were taken into 'protective' custody by their own comrades. They were handed over to the Police after 2 days, by which time it was no longer possible to examine the mental state of the Rangers at the time of the incident.


2011 Pakistan Rangers shooting incident, Aftermath
Ali Dayan Hasan, the Pakistani researcher for Human Rights Watch, said the killing "provides chilling evidence of the abusive, trigger-happy practices of Pakistan's military, paramilitary and civilian agencies". Ajaz Chaudhry of the DG Rangers claimed that an inquiry would be underway and those responsible would be brought to justice. Iftakhar Ahmad Chouhdary, the chief Justice of Pakistan, transferred the case to the court of anti-terrorism.


2011 Pakistan Rangers shooting incident, Aftermath
Also shortly after the incident, the chief of the Sindh Rangers, Fayaaz Leghari, was fired from his post by the Pakistani Government on orders of the Supreme Court. The chief Inspector General of the Sindh Police who allegedly misconducted the investigation was also fired from his post.


2011 Pakistan Rangers shooting incident, Aftermath
Shahid Zafar, the Ranger who shot Sarfaraz Shah, was convicted of murder in the Sindh High Court where he was later sentenced to death after being found guilty of the offence. The Ranger and his lawyer later appealed the verdict in the Supreme Court of Pakistan which upheld the death sentence against the accused upon reviewing the case, while punishments for others involved were adjusted.


2011 Pakistan Rangers shooting incident, Aftermath
The Government authorities has petitioned the President of Pakistan for pardon for all the accused under the Article 45 of the Constitution. It was reported in some sections of the media that the pardon has been granted, but was refuted by the President's office.


2011 Palanca Awards
The Carlos Palanca Memorial Awards for Literature winners for 2011 received their medals (for first Prize winners only), certificates (for all winners) and cash prizes during awarding ceremonies held on September 1, 2011, at the Peninsula Hotel Manila in Makati. Guest of honor and speaker was National Artist for Literature Francisco Sionil Jose, who was conferred the Gawad Dangal ng Lahi by awards director, Sylvia Palanca - Quirino. Victor Emmanuel Carmelo 'Vim' Nadera served as Master of Ceremonies.