2018 Pacific hurricane season, Systems, Hurricane Norman
A tropical wave left the western coast of Africa on August 14 and tracked westward across the tropics with little convection. The wave moved over Central America and entered the Pacific Ocean on August 22. Convection subsequently increased and became better organized over the next couple of days. An area of low-pressure developed and convection gradually became more organized. A tropical depression spawned around 12:00 UTC on August 28, at approximately 490 mi (790 km) west-southwest of Manzanillo, Mexico. The depression strengthened into Tropical Storm Norman about six hours later.


2018 Pacific hurricane season, Systems, Hurricane Norman
The cyclone began traveling towards the west-northwest shortly after, moving along the southern edge of a subtropical ridge that extended over the Eastern Pacific Ocean. Located within a favorable environment of moist air, low wind shear, and 84–86 °F (29–30 °C) sea surface temperatures, Norman began a two-day period of rapid intensification around 18:00 UTC on August 28. The storm strengthened into a hurricane one day later.


2018 Pacific hurricane season, Systems, Hurricane Norman
It reached its peak intensity on August 30 at 18:00 UTC as a Category 4 hurricane with winds of 150 miles per hour (240 km/h) and a pressure of 937 mbar (27.67 inHg), while 520 mi (835 km) southwest of the southern tip of the Baja California peninsula. During this time, the hurricane turned westward and later towards the west-southwest as the ridge consolidated and extended further west. Increasing northeasterly wind shear caused Norman to gradually weaken over the next couple of days.


2018 Pacific hurricane season, Systems, Hurricane Norman
The storm fell to Category 2 status by 06:00 UTC on September 1 and maintained that intensity for around a day. Norman then began tracking west-northwestward while the wind shear relaxed, allowing for another period of rapid strengthening. Norman reached its secondary peak at 18:00 UTC on September 2 as a Category 4 hurricane with winds of 140 miles per hour (230 km/h).


2018 Pacific hurricane season, Systems, Hurricane Norman
Soon after, the hurricane began to weaken once more as it traveled through a region of cooler sea surface temperatures. Norman crossed into the Central Pacific after 00:00 UTC on September 4 as a high-end Category 1 hurricane. The weakening trend continued as Norman tracked westward under the influence of a subtropical ridge that was located to the north and northeast; the cyclone's eye filled in with clouds. The hurricane began a third period of rapid intensification as it moved across warmer sea surface temperatures and an area of low wind shear.


2018 Pacific hurricane season, Systems, Hurricane Norman
Norman reached its tertiary peak intensity on September 5 at 18:00 UTC as a 120 miles per hour (190 km/h) Category 3 hurricane; at that time, it possessed a well-defined eye. On the next day, declining sea surface temperatures and moderate wind shear caused Norman to weaken as it turned northwest. By 18:00 UTC on September 7, Norman had weakened into a tropical storm, while over several hundred miles northeast of the Hawaiian Islands. Wind shear further increased as the system turned northward, exposing the low-level center and prompting more weakening. Norman was downgraded to a post-tropical cyclone around 00:00 UTC on September 9. The remnants turned northeastward and dissipated on September 10 by 12:00 UTC, around 805 mi (1,295 km) north-northeast of the Hawaiian Islands.


2018 Pacific hurricane season, Systems, Hurricane Olivia
A disturbance spawned over the southwestern Caribbean Sea on August 26 and tracked westward, crossing over Central America and entering the Pacific Ocean a couple of days later. Associated convection increased as the disturbance gradually organized over the next few days. A tropical depression formed by 00:00 UTC on September 1, approximately 405 mi (650 km) southwest of Manzanillo, Mexico. The nascent depression tracked west-northwestward as northeasterly shear inhibited the system from intensifying for nearly a day.


2018 Pacific hurricane season, Systems, Hurricane Olivia
Despite the shear, the system became Tropical Storm Olivia around 00:00 UTC on September 2, while it was about 520 mi (835 km) south of Cabo San Lucas, Mexico. The storm then moved northwest and strengthened gradually before the shear abated on September 3. Olivia turned towards the west and began a period of rapid intensification, reaching hurricane intensity on September 4 at 00:00 UTC, while located 575 mi (925 km) southwest of Cabo San Lucas. The cyclone reached its initial peak intensity as a high-end Category 3 hurricane by 00:00 on September 5.


2018 Pacific hurricane season, Systems, Hurricane Olivia
Soon after, increasing shear and dry air caused Olivia to weaken. The storm weakened into a minimal Category 2 hurricane before an unexpected, second period of intensification commenced on September 6. Olivia peaked at 00:00 UTC on September 7 as a Category 4 hurricane with winds of 130 miles per hour (210 km/h) and a pressure of 951 mbar (28.08 inHg), while over 1,265 mi (2,035 km) west of Cabo San Lucas. Lower sea surface temperatures and a more stable environment caused the hurricane to begin weakening before it crossed into the Central Pacific around 00:00 September 9.


2018 Pacific hurricane season, Systems, Hurricane Olivia
This trend continued until slightly higher sea surface temperatures allowed the now-minimal Category 1 hurricane to restrengthen slightly and reach a secondary peak by 00:00 UTC on September 10. After 12 hours, the cyclone began to weaken again, falling to tropical storm strength by 06:00 UTC on September 11. Olivia made landfall as a 45 miles per hour (72 km/h) tropical storm at 19:10 UTC on September 12, about 10 mi (15 km) northwest of Kahului, Maui. Just over 40 minutes later, the storm made a second landfall about 5 mi (8.0 km) north-northwest of Lanai City.


2018 Pacific hurricane season, Systems, Hurricane Olivia
Olivia's two landfalls were the first time in recorded history that a tropical cyclone had made landfall on both islands. The storm moved west-southwestward, away from the Hawaiian Islands, and weakened into a tropical depression on September 13 at 06:00 UTC. Olivia became a tropical storm once more by 18:00 UTC but failed to intensify further. Strong wind shear and disruption from its two landfalls in Hawaii caused the cyclone to become post-tropical by 06:00 UTC on September 14 and open up into a trough about 12 hours later.


2018 Pacific hurricane season, Systems, Hurricane Olivia
Olivia's approach towards the Hawaiian Islands prompted the issuance of tropical storm watches and warnings for Hawaii County, Oahu, Maui County, and Kauai County. Hawaii Governor David Ige declared Hawaii, Maui, Kalawao, Kauai, and Honolulu counties disaster areas prior to Olivia's landfall in order to activate emergency disaster funds and management. Olivia made brief landfalls in northwest Maui and Lanai on September 12, becoming the first tropical cyclone to impact the islands in recorded history. Tropical-storm-force winds mainly affected Maui County and Oahu.


2018 Pacific hurricane season, Systems, Hurricane Olivia
Torrential rainfall occurred on both Maui and Oahu, peaking at 12.93 in (328 mm) in West Wailuaiki, Maui. On Maui, Olivia felled trees, caused thousands of power outages, and caused severe flooding. In Honokohau Valley, the Honokohau stream rose over 15 ft (4.6 m), submerging a bridge and inundating over a dozen homes. Multiple homes and vehicles were swept away by floodwaters. Olivia left the valley without potable water for more than a week. Several hundred power outages occurred on Molokai, and around 1,100 lost power in Honolulu. A pipe overflowed from excessive rainfall on Oahu, sending raw sewage into Kapalama Stream and Honolulu Harbor. President Donald Trump issued a disaster declaration for Hawaii to aid with emergency response efforts. Olivia caused a total of US$25 million in damage throughout Hawaii.


2018 Pacific hurricane season, Systems, Tropical Storm Paul
A tropical wave departed from the western coast of Africa on August 17. It then moved westward across the Atlantic Ocean with minimal convection until it crossed over Central America, entering the Eastern Pacific Ocean. Convection began to increase during the next few days, but this trend was hampered by strong northeasterly wind shear. The system produced sporadic convection until September 8, when thunderstorm activity became continuous. A tropical depression formed around 06:00 UTC on September 8, approximately 680 mi (1,095 km) south-southwest of the southern tip of the Baja California peninsula.


2018 Pacific hurricane season, Systems, Tropical Storm Paul
The system intensified into Tropical Storm Paul by 00:00 UTC on September 9. The storm traveled westward before turning northwest as it rounded the southwestern edge of a mid-level ridge, which was located over Central Mexico. Paul intensified slightly, peaking at 18:00 UTC with winds of 45 miles per hour (72 km/h) and a pressure of 1,002 mbar (29.59 inHg).


2018 Pacific hurricane season, Systems, Tropical Storm Paul
By September 10, Paul began to be affected by an unfavorable environment of dry air, wind shear, and cooling sea surface temperatures. This caused the storm to weaken into a tropical depression by 06:00 UTC on September 11. The depression's convection dispersed later in the day, resulting in the system being downgraded to a remnant low around 00:00 UTC on September 12 while it was about 1,035 mi (1,665 km) west of the southern tip of the Baja California peninsula. A low-level ridge located north of the remnants caused them to return to a westward motion for a couple of days, before a high-pressure system located over the Central Pacific caused them to quickly turn southwestward. The system became elongated and dissipated by 00:00 UTC on September 15.


2018 Pacific hurricane season, Systems, Tropical Depression Nineteen-E
A tropical wave departed from the western coast of Africa on August 29 and traveled across the tropical Atlantic before reaching the Pacific Ocean around September 6–7. The wave then meandered south of Mexico for around a week. Around the same time, a mid-level trough, which was moving southward, sent moisture into the region. This allowed a surface trough to develop in a north to south orientation over Baja California Sur and the Gulf of California.


2018 Pacific hurricane season, Systems, Tropical Depression Nineteen-E
Initially quite disorganized, thunderstorm activity gathered around a circulation center on September 19, causing a tropical depression to spawn around 12:00 UTC, just off the coast of Loreto, Mexico. This made the system the first tropical cyclone to form in the Gulf of California in recorded history. Tropical Depression Nineteen-E moved mainly northward and reached its peak intensity by 18:00 UTC with winds of 35 miles per hour (56 km/h) and a pressure of 1,002 mbar (29.59 inHg). Wind shear and land interaction inhibited further intensification before the cyclone made landfall between Guaymas and Ciudad Obregón on the Sonoran coast, around 03:00 UTC on September 20. The depression dissipated by 06:00 UTC, about 60 mi (95 km) inland.


2018 Pacific hurricane season, Systems, Tropical Depression Nineteen-E
Tropical Depression Nineteen-E brought torrential rainfall to western Mexico, with a peak total of 15.06 in (382.5 mm) occurring in Ahome, Sinaloa. In Nogales, Sonora, over 300 metric tons (330.7 US tons) of debris had to be cleared from roadways. Floodwaters killed and swept away the bodies of two people in the state. The depression directly killed five people and indirectly killed two in Sinaloa state. Over 300,000 structures were inundated in state, leaving behind hundreds of millions (USD) in flood damage.


2018 Pacific hurricane season, Systems, Tropical Depression Nineteen-E
The storm caused an additional US$41 million (MX$800 million) in damage after destroying 35,000 acres (14,000 hectares) of crops and associated equipment. Nineteen-E also left over 500,000 livestock dead in the state. The cyclone killed another three people in Chihuahua state. The remnants of Nineteen-E drew moisture from the Gulf of Mexico and entered the U.S. states of Arizona, Texas, Oklahoma, and Arkansas, causing US$250 million in damage. The highest rainfall in the United States, 15.81 in (401.6 mm), occurred in Johnston County, Oklahoma. One person was killed by flooding in the state of Texas. Fonden announced that it would provide US$1.5 million (MX$33 million) for the reconstruction of Culican, Sinaloa, in 2019.


2018 Pacific hurricane season, Systems, Hurricane Rosa
A robust tropical wave departed from the western coast of Africa on September 6 and was located south of the Gulf of Tehuantepec by September 22. Upon arrival, thunderstorm activity increased significantly and the system developed a center of circulation. A tropical depression spawned at 06:00 UTC on September 25, around 405 mi (650 km) south-southwest of Manzanillo, Mexico. Despite being affected by northeasterly shear, the depression developed banding features. This increase in organization led to the depression becoming Tropical Storm Rosa around 12:00 UTC on the same day. While tracking northwest, Rosa began to develop a low-level eye feature.


2018 Pacific hurricane season, Systems, Hurricane Rosa
A period of rapid intensification ensued with Rosa becoming a hurricane at 12:00 UTC on September 26. This trend continued as Rosa turned more westward. Rosa peaked as a Category 4 hurricane on September 28 at 06:00 UTC with winds 150 miles per hour (240 km/h) and a pressure of 936 mbar (27.64 inHg). An eyewall replacement cycle began shortly after, causing a period of weakening to commence. As Rosa turned northwestward, a worsening environment aloft caused the weakening trend to continue. The cyclone was tracking northeastward by September 30 and rapidly weakened. Rosa made landfall around 11:00 UTC on October 2 as a 35 miles per hour (56 km/h) tropical depression, about 70 mi (115 km) southeast of Punta San Antonio on the Baja California Peninsula. Rosa interacted with mountainous terrain after landfall and dissipated by 18:00 UTC.


2018 Pacific hurricane season, Systems, Hurricane Rosa
Rosa warranted the issuance of tropical storm watches and warnings along the western and eastern coasts of the Baja California Peninsula. Rainfall from Rosa was heaviest in Baja California, with a peak total of 6.54 in (166 mm) occurring in Percebu. Flooding caused road damage and sinkholes in San Felipe, Baja California; the town's port lost  US$530,000 (MX$10 million) after having been closed. In Sonora, thunderstorms caused power outages and flooding; the flooding swept away vehicles, left roadways impassable, damaged dozens of homes and businesses, and killed one woman.


2018 Pacific hurricane season, Systems, Hurricane Rosa
In the United States, Rosa's remnants caused torrential rainfall and flooding in the Four Corners region; 6.89 in (175 mm) of rain was reported at Towers Mountain, Arizona. In addition to flooding, Rosa's remnants caused power outages, several dozen accidents near Phoenix, and two traffic-related deaths outside Phoenix. A community near Sells, Arizona had to be evacuated on October 2 after an earthen dam neared maximum capacity; the dam did not breach and residents were allowed to return two weeks later. Damage caused by Rosa's remnants totaled about US$50 million in the Southwestern United States.


2018 Pacific hurricane season, Systems, Hurricane Sergio
A disturbance located over South America on September 24 crossed over Central America during the next couple of days. Convection associated with the system increased, however, the system remained quite disorganized. Continual convection occurred by September 28 as the system began producing gale-force winds. A low-level center developed on September 29 and became better defined. Tropical Storm Sergio formed by 12:00 UTC on that day, around 385 mi (620 km) south of Zihuatanejo, Mexico. During its first few days, Sergio tracked westward and later towards the west-southwest.


2018 Pacific hurricane season, Systems, Hurricane Sergio
It only slowly strengthened as a result of its large size and dry air entanglement. The cyclone became a hurricane at about 00:00 UTC on October 2 after its eyewall fully closed. The storm then rapidly intensified over the next day.


2018 Pacific hurricane season, Systems, Hurricane Sergio
An eyewall replacement cycle that took place during October 3 caused the intensification to temporarily cease; Sergio began to intensify again by 18:00 UTC. Sergio peaked around 06:00 UTC on October 4 as a Category 4 hurricane with winds of 140 miles per hour (230 km/h) and a pressure of 942 mbar (27.82 inHg), while located 825 mi (1,325 km) southwest of Cabo San Lucas, Mexico.


2018 Pacific hurricane season, Systems, Hurricane Sergio
A second eyewall replacement cycle caused the cyclone to weaken into a Category 3 on October 5 before it reintensified later in the day. Sergio traveled towards the west and west-southwest throughout this period. The cyclone went through a third eyewall replacement cycle on October 8 as it tracked northeastward. Sergio acquired annular characteristics as it weakened slightly during the next couple of days. The storm then quickly weakened as it was propelled towards the Baja California Peninsula.


2018 Pacific hurricane season, Systems, Hurricane Sergio
Sergio made landfall near Los Castros, Baja California Sur around 12:00 UTC on October 12 with 50 miles per hour (80 km/h) winds. The tropical storm then emerged into and traversed the Gulf of California before making a second landfall as a tropical depression around 18:00 UTC, about 25 mi (40 km) west-northwest of Guaymas, Sonora. Sergio dissipated over mountainous terrain a few hours later.


2018 Pacific hurricane season, Systems, Hurricane Sergio
Sergio necessitated the issuance of tropical storm watches and warnings for the Baja California Peninsula. Gale-force winds damaged infrastructure in Guaymas, Sonora, causing US$2.12 million (MX$40 million) in damage. Rainfall from the storm peaked at 5.05 in (128 mm) in Punta de Aqua II. Houses were inundated by floodwaters in the states of Sonoroa and Chihuahua, leaving behind damage. Moisture from Sergio's remnants led to the development of thunderstorms over Texas around October 12–13. Ten tornadoes spawned across the state as a result, collectively inflicting about US$445,000 in damage. Strong winds and hail from the thunderstorms caused another US$30,000 in damage. Sergio's remnants also caused flash flooding in the state of Arizona, dealing US$73,000 in damage.


2018 Pacific hurricane season, Systems, Hurricane Walaka
A weak surface trough entered the Central Pacific Ocean on September 26 and continued westward for the next couple of days. The system began to organize on September 29 as continual convection and banding features developed near its center. A tropical depression formed around 12:00 UTC and strengthened into Tropical Storm Walaka six hours later, while located around 690 mi (1,110 km) south of Honolulu, Hawaii. A favorable environment below the storm and aloft allowed Walaka to rapidly intensify into a hurricane by 18:00 UTC on September 30.


2018 Pacific hurricane season, Systems, Hurricane Walaka
The cyclone's eye and the surrounding clouds became well established late on October 1. Walaka peaked as a Category 5 hurricane at 00:00 UTC on October 2 with winds of 160 miles per hour (260 km/h) and a pressure of 921 mbar (27.20 inHg). This intensity made Walaka the fourth major hurricane in the Central Pacific and second Category 5 hurricane of the season.


2018 Pacific hurricane season, Systems, Hurricane Walaka
After peaking, Walaka began to undergo an eyewall replacement cycle. The cyclone weakened into a minimal Category 4 hurricane by 00:00 UTC on October 3 before briefly reintensifying later in the day. Increasing wind shear and lower sea surface temperatures caused Walaka to quickly weaken over the next couple of days, with the system falling to tropical storm strength by 06:00 UTC on October 5. Walaka transitioned into an extratropical system by 12:00 UTC on October 6 as it traveled north-northeastward. The extratropical system continued in that direction and dissipated by 18:00 UTC on October 7.


2018 Pacific hurricane season, Systems, Hurricane Walaka
Tropical cyclone watches and warnings were issued for Johnston Atoll and the Northwestern Hawaiian Islands as a result of the threat Walaka posed. The cyclone made landfall 35 mi (55 km) west-northwest of French Frigate Shoals as a high-end Category 3 hurricane around 06:20 UTC on October 4. Walaka's only impact to land was that its storm surge completely destroyed East Island, wiping out the nesting grounds for the endangered green sea turtle and critically endangered Hawaiian monk seal.


2018 Pacific hurricane season, Systems, Tropical Storm Tara
A low-level gyre located over Central America, which was also associated with the formation of Hurricane Michael in the Caribbean Sea, contributed to the genesis of Tropical Storm Tara. During the period of October 7–10, the disturbance moved into the Gulf of Tehuantepec, after which convection increased. The system then traveled west-northwest over the next several days, parallel to the western coast of Mexico. The system's convection then increased in organization, resulting in the genesis of a tropical depression at approximately 12:00 UTC on October 14, around 185 mi (300 km) southeast of Manzanillo, Mexico. The nascent depression turned from the west-northwest to the north-northwest as it tracked through a weakness in a trough located over northern Baja California and a mid-level high located over the Gulf of Mexico.


2018 Pacific hurricane season, Systems, Tropical Storm Tara
Despite the presence of easterly wind shear, the system became a tropical storm around 06:00 UTC on October 15, while located about 110 mi (175 km) south-southeast of Manzanillo, Mexico. The cyclone continued to intensify and peaked at 00:00 UTC on October 16 with winds of 65 miles per hour (105 km/h) and a pressure of 995 mbar (29.38 inHg). Steering currents around Tara significantly weakened, almost halting the cyclone's forward motion. A combination of land interaction and increasing southeasterly wind shear caused weakening to commence. Tara opened into a trough just west of Manzanillo around 00:00 on October 17 and dissipated soon after.


2018 Pacific hurricane season, Systems, Tropical Storm Vicente
A tropical wave departed from the western coast of Africa on October 6 and traveled westward, arriving at Central America on October 16. Soon after, convection formed along the monsoon trough near the wave. Convection increased and gradually organized over the next few days. A tropical depression formed on October 19 around 06:00 UTC, around 90 mi (145 km) west-southwest of Puerto San José, Guatemala. Located within a favorable environment, the nascent depression quickly became better organized, developing banding features around its center. This led to the development of Tropical Storm Vicente by 18:00 UTC on the same day.


2018 Pacific hurricane season, Systems, Tropical Storm Vicente
During the course of the day, the cyclone tracked northwestward at around 6 mph (9.7 km/h), while it was also very close to the Guatemalan shore. Vicente began traveling west-northwest on October 20, just off the coast of southeastern Mexico. Vicente peaked at 18:00 UTC with winds of 50 miles per hour (80 km/h) and a pressure of 1,002 mbar (29.59 inHg), while less than 115 mi (185 km) off the Mexican coast.


2018 Pacific hurricane season, Systems, Tropical Storm Vicente
During the overnight, Vicente began tracking westward. Dry air intrusion caused the tropical storm to weaken on October 21 as it traveled south of west. The dry air abated on October 22, allowing for some re-intensification. Outflow from Hurricane Willa, which was located to the northwest, produced northerly wind shear, which caused Vicente to weaken to a tropical depression by 06:00 UTC on October 23. Vicente made landfall near Playa Azul in Michoacán around 13:30 UTC and dissipated by 18:00 UTC after interacting with land.


2018 Pacific hurricane season, Systems, Tropical Storm Vicente
Vicente brought torrential rainfall to southern Mexico, peaking at over 12 in (300 mm) in the state of Oaxaca. Twenty-seven neighborhoods were flooded in Morelia, Michoacán; hundreds of homes were inundated throughout several neighborhoods after flooding 3.3 ft (1 m) deep occurred. Heavy rainfall caused flooding and landslides in Oaxaca, leaving 13 people dead. Roadways in the state suffered severe damage after dozens of landslides occurred. Flood waters swept away cars, created a sinkhole, and inundated dozens of homes and businesses. Flooding in the state of Veracruz left another three people dead. Nearly two dozen landslides occurred in the state, damaging over three dozen roads and schools. The overflow of the Coatzacoalcos River flooded several hundred houses. The storm left agricultural losses of US$7.05 million (MX$136 million) in Colima state.


2018 Pacific hurricane season, Systems, Hurricane Willa
A tropical wave departed from the western coast of Africa on October 2 and moved across the tropical Atlantic with minimal convection. The wave arrived at Central America on October 15 and entered the Pacific Ocean on the next day. Convection formed around the wave on October 17; a low-pressure system developed in association with the wave early on October 18. Thunderstorm activity continued to coalesce, and a tropical depression formed by 00:00 UTC on October 20, approximately 265 mi (425 km) south of Manzanillo, Mexico. The system tracked west-northwest and northwest as it continued to organize.


2018 Pacific hurricane season, Systems, Hurricane Willa
An increase in convection and the formation of a central dense overcast resulted in the depression being upgraded to Tropical Storm Willa by 12:00 UTC on the same day, about 290 mi (465 km) south-southwest of Manzanillo. A favorable environment along with Willa's smaller size allowed the cyclone to rapidly intensify for nearly two days.


2018 Pacific hurricane season, Systems, Hurricane Willa
Willa reached hurricane intensity by 06:00 UTC on October 21 and became a major hurricane around 18:00 UTC. Willa peaked as a Category 5 hurricane on October 22 at 06:00 UTC with winds of 160 miles per hour (260 km/h) and a pressure of 925 mbar (27.32 inHg), while located 195 mi (315 km) south-southwest of Cabo Corrientes, Mexico.


2018 Pacific hurricane season, Systems, Hurricane Willa
After peaking, a combination of cooling sea surface temperatures and an eyewall replacement cycle caused Willa to steadily weaken. The hurricane's eye increased sixfold in size between Willa's peak intensity and the start of October 23. After the replacement cycle ended later that day, the now-Category 3 hurricane tracked northeastward. Around 01:20 UTC on October 24, Willa made landfall near Palmito del Verde, Sinaloa with 115 miles per hour (185 km/h).


2018 Pacific hurricane season, Systems, Hurricane Willa
Strong southwesterly shear along with the mountainous terrain of Mexico caused Willa to rapidly decline in intensity; the cyclone was a mid-grade tropical storm around 06:00 UTC, while located only 10 mi (15 km) southeast of Durango, Mexico. The storm dissipated six hours later and sent remnant moisture into southern Texas and Louisiana.


2018 Pacific hurricane season, Systems, Hurricane Willa
Hurricane Willa necessitated the issuance of tropical cyclone watches and warnings along the southwestern coast of Mexico. As a precautionary measure, over 200,000 people were evacuated from coastal regions in advance of the storm. Willa brought winds up to 115 miles per hour (185 km/h) to the region where it made landfall and torrential rainfall to multiple states; rainfall peaked at 15.39 in (391 mm) in San Andrés Milpillas, Nayarit. Willa wrought catastrophic damage throughout the region where it made landfall, with damage totaling US$825 million (MX$17.2 billion).


2018 Pacific hurricane season, Systems, Hurricane Willa
The town of Los Sandovales in Acaponeta Municipality, Nayarit, was completely destroyed by Willa. The cyclone left a total of 9 people dead throughout four Mexican states. The storm isolated multiple communities in Sinaloa and Nayarit; the San Pedro and Acaponeta rivers flooded, leaving 180,000 people without food and outside communication for at least one week after the storm. Multiple cities in the states of Sinaloa and Nayarit were left without any potable water, and in some cases, this remained the case for several months after the storm. Around 100,000 people were left homeless in Nayarit.


2018 Pacific hurricane season, Systems, Hurricane Willa
In Sinaloa, 2,000 families were living under plastic rooves half a year after the storm. Reconstruction in Sinaloa did not occur in the months after the storm; a state official stated it could take years to receive federal funding. Reconstruction efforts in Nayarit were hampered by the state government's bankruptcy. The Mexican federal government allocated US$94 million (MX$2.25 billion) towards Nayarit reconstruction, with work slated to begin in February 2019.


2018 Pacific hurricane season, Systems, Tropical Storm Xavier
A tropical wave moved off of the western coast of Africa on October 17 and traveled westward across the tropics and the Caribbean Sea with limited thunderstorm activity. The wave moved over Central America on October 26 and later into a cyclonic gyre that extended over a large portion of the Eastern Pacific on October 31. A passing Kelvin wave fueled an increase in convection along the wave, leading to the formation of a low-pressure system. Over the next couple of days, associated convection continued to increase and organize.


2018 Pacific hurricane season, Systems, Tropical Storm Xavier
A tropical depression spawned at 12:00 UTC on November 2, about 520 mi (835 km) southwest of Manzanillo. The nascent depression tracked towards the east-northeast between a mid-level ridge which was located to the southeast and a mid- to upper-level trough which was located to the north and northwest. Despite being located in a region of high southwesterly wind shear, disparate upper-level flows allowed the depression to intensify into Tropical Storm Xavier by 00:00 UTC on November 3. The tropical storm continued to gradually strengthen over the next day and a half. Xavier reached its peak intensity at 12:00 UTC on November 4 with winds of 65 miles per hour (105 km/h) and a pressure of 995 mbar (29.38 inHg), while around 130 mi (210 km) southwest of Manzanillo.


2018 Pacific hurricane season, Systems, Tropical Storm Xavier
At its closest position to the coast, Xavier was only 90 mi (145 km) southwest of Manzanillo. Meanwhile, the storm turned northward and subsequently entered a region of dry mid-level air and more powerful southwesterly wind shear. This caused Xavier to quickly weaken; the low-level center completely detached from the storm's convection by 12:00 UTC on November 5. Xavier was downgraded to a post-tropical cyclone by 00:00 UTC on November 6. The remnants traveled west-northwest and later west-southwest while continuing to weaken. The post-tropical system opened up into a trough by 00:00 UTC on November 9, while located around 345 mi (555 km) west-southwest of Socorro Island.


2018 Pacific hurricane season, Systems, Other systems
An upper-level low absorbed the remnants of Hurricane Lane to the west-northwest of Hawaii on August 29. The storm was assigned the designation 96C by the United States Naval Research Laboratory (NRL). Traversing an area of sea surface temperatures about 3.6 °F (2 °C) above-normal, the system coalesced into a subtropical storm by August 31. However, the National Oceanic and Atmospheric Administration's Satellite Products and Service Division analyzed it as a tropical storm through the Dvorak technique.


2018 Pacific hurricane season, Systems, Other systems
At 23:30 UTC that day, Scatterometer data revealed that 96C attained peak winds of 45 miles per hour (72 km/h) about 980 mi (1,575 km) south of Adak, Alaska. The system reached its peak intensity early on September 2, displaying an eye feature. Afterward, 96C gradually began to weaken, while accelerating northward into colder waters. The system weakened into an extratropical low on September 3. The system was absorbed by a larger extratropical storm in the Bering Sea on September 4.


2018 Pacific hurricane season, Storm names
The following list of names was used for named storms that form in the Northeastern Pacific Ocean during 2018. No names were retired, so this list will be used again in the 2024 season. This is the same list used in the 2012 season. The name Vicente was used for the first time this year, while the names Willa and Xavier were both used once in 1962 and 1992, respectively.


2018 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. Only the name Walaka was used during the 2018 season.


2018 Pacific hurricane season, Season effects
This is a table of all the storms that have formed in the 2018 Pacific hurricane season. It includes their duration, names, affected areas, damages, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a tropical wave, or a low, and all the damage figures are in USD. Potential tropical cyclones are not included in this table.


2018 Pacific typhoon season
The 2018 Pacific typhoon season was at the time, the costliest Pacific typhoon season on record, until the record was beaten by the following year. The season was above-average, producing 29 storms, 13 typhoons, and 7 super typhoons. It was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the western Pacific Ocean. The season ran throughout 2018, though most tropical cyclones typically develop between May and October. The season's first named storm, Bolaven, developed on January 3, while the season's last named storm, Man-yi, dissipated on November 28. The season's first typhoon, Jelawat, reached typhoon status on March 29, and became the first super typhoon of the year on the next day.


2018 Pacific typhoon season
The scope of this article is limited to the Pacific Ocean, to the north of the equator between 100°E and the 180th meridian. Within the northwestern Pacific Ocean, there are two separate agencies that assign names to tropical cyclones, which can often result in a cyclone having two names, one from the JMA and one from PAGASA.


2018 Pacific typhoon season
The Japan Meteorological Agency (JMA) 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, while the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) 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 regardless of whether or not a tropical cyclone has already been given a name by the JMA. Tropical depressions that are monitored by the United States' Joint Typhoon Warning Center (JTWC) are given a number with a "W" suffix.


2018 Pacific typhoon season, Seasonal forecasts
During the year, 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 included the Tropical Storm Risk (TSR) Consortium of University College London, PAGASA and Taiwan's Central Weather Bureau. The first forecast of the year was released by PAGASA on January 15, within its seasonal climate outlook for the period January–June.


2018 Pacific typhoon season, Seasonal forecasts
The outlook noted that one to three tropical cyclones were expected between January and March, while two to four were expected to develop or enter the Philippine Area of Responsibility between April and June. PAGASA also mentioned that the La Niña would be short-lived, predicting that it would last until February or April.


2018 Pacific typhoon season, Seasonal forecasts
On March 15, the Vietnamese National Center for Hydro Meteorological forecasts (VNCHMF) predicted that roughly twelve to thirteen tropical cyclones would affect Vietnam during 2018, which is above average. On March 23, the Hong Kong Observatory predicted that five to eight tropical cyclones would come within 500 kilometres of Hong Kong, which is normal to above normal, with the first tropical cyclone affecting Hong Kong in June or earlier.


2018 Pacific typhoon season, Seasonal forecasts
On May 11, the Tropical Storm Risk (TSR) issued their first forecast for the season, predicting that the 2018 season would be a slightly above average season with 27 named storms, 17 typhoons, and nine intense typhoons. The TSR released their second forecast on July 6, still predicting that the season will be above average, with the only changes to their forecast increasing the number of intense typhoons from 9 to 10.


2018 Pacific typhoon season, Seasonal forecasts
The PAGASA issued their second and final outlook on July 13 for the period of July – December, predicting six to eight tropical cyclones were expected to develop or enter their area of responsibility between July and September, while four to six were forecast during October to December. On August 7, TSR released their final forecast, with its only changes decreasing the numbers of intense typhoons from 10 to 9, as well as decreasing its ACE forecast from 331 units to 319 units.


2018 Pacific typhoon season, Season summary
2018 opened with Tropical Depression Agaton active to the east of the Philippines. Over the course of two days, the system moved into the South China Sea and intensified into the first named storm, Bolaven. A month later, Tropical Storm Sanba developed and affected the southern Philippines. About another month later, Tropical Depression 03W formed in the open Pacific and was named Jelawat. Jelawat intensified into the season's first typhoon on March 30, and then the season's first super typhoon.


2018 Pacific typhoon season, Season summary
Tropical activity fired up by June, when a series of storms developed, with Tropical Storm Ewiniar making landfall over mainland China. Later that month, Typhoon Prapiroon developed and affected the Korean Peninsula, becoming the first to do so since 2013. Thereafter, Typhoon Maria developed and reached its peak intensity as a Category 5 super typhoon, being the first typhoon to reach that intensity since Typhoon Nock-ten in 2016. Hurricane Hector crossed the International Date Line on August 13, the first to do so since Genevieve in 2014. Systems like Tropical Storms Son-Tinh, Ampil, Josie, Wukong, Jongdari, Shanshan, Yagi, Leepi, Bebinca, and Rumbia formed between late July to early August.


2018 Pacific typhoon season, Season summary
On August 16, Typhoon Soulik developed and headed north, until a Fujiwhara interaction with Typhoon Cimaron (which formed after Soulik) made it head west towards the East China Sea. It later made landfall on South Korea, making it the first typhoon to make landfall on South Korea since Typhoon Chaba in 2016. Cimaron made landfall near Kyoto, Japan on August 23. As Cimaron was nearing landfall, Tropical Depression Luis formed, which made landfall on China and Taiwan. Later that month, Typhoon Jebi developed over the West Pacific and intensified into the third super typhoon of the season.


2018 Pacific typhoon season, Season summary
In September, Typhoon Mangkhut became the fourth super typhoon of the season and made landfall on the island of Luzon in the Philippines. On the same day, Tropical Depression Neneng formed, which later became Tropical Storm Barijat and made landfall on Vietnam. By late September, Typhoon Trami (Paeng) formed, becoming the 5th super typhoon of 2018. While Typhoon Trami was in the Western Pacific, nearing Okinawa with winds of 165 km/h (105 mph), Tropical Depression 30W formed, and was named Kong-rey by the JMA after strengthening into a tropical storm. It intensified into a super typhoon on October 2, becoming the 5th Category 5 super typhoon. Later on in the month, it was followed by the sixth and final Category 5-equivalent storm of the season, Yutu.


2018 Pacific typhoon season, Systems, Tropical Storm Bolaven (Agaton)
A low-pressure area developed into a tropical depression northeast of Palau on December 29, 2017. The system moved generally westward, and on the first day of 2018, the PAGASA began issuing advisories on the system and locally named it Agaton. Both the JMA and the JTWC followed suit, with the latter designating the system as 01W. By January 3, the system had intensified into a tropical storm according to the JMA and was named Bolaven, thus becoming the first named storm of the season. However, several hours later, Bolaven started to weaken and rapidly deteriorate. The system was last tracked by the JMA to the east of Vietnam on January 4.


2018 Pacific typhoon season, Systems, Tropical Storm Bolaven (Agaton)
The impact caused by Bolaven (Agaton) was moderate but not as significant as the previous two systems, Kai-tak and Tembin, with about 2,000 passengers stranded in ports in the Visayas. As of January 22, three people have been reported killed by the storm, while total damages were up to Ph₱554.7 million (US$11.1 million).


2018 Pacific typhoon season, Systems, Tropical Storm Sanba (Basyang)
A low-pressure system developed into a tropical depression north of Chuuk early on February 8. It developed into a tropical storm on February 11, receiving the international name Sanba by the JMA. Shortly afterwards, Sanba entered the Philippine area of responsibility and was assigned the local name Basyang by the PAGASA. On February 13, Sanba made landfall on Cortes, Philippines, causing it to weaken to a tropical depression. On the next day, the system weakened into a remnant low as it made another landfall in Surigao del Sur.


2018 Pacific typhoon season, Systems, Tropical Storm Sanba (Basyang)
Approximately 17,000 people were affected by the storm and there were 14 fatalities. Total agricultural damages were at Php 168 million (US$3.23 million).


2018 Pacific typhoon season, Systems, Typhoon Jelawat (Caloy)
On March 24, a tropical depression formed to the south of the Mariana Islands, and the JTWC assigned it the numerical identifier 03W. On March 25, the system intensified into a tropical storm and was named Jelawat by the JMA, and at the same time it entered PAGASA's Philippine Area of Responsibility (PAR) and was assigned the local name Caloy. Due to strong southwesterly wind shear, the cyclone remained poorly organized, with disorganized convection near an exposed low-level circulation.


2018 Pacific typhoon season, Systems, Typhoon Jelawat (Caloy)
Conditions gradually became more favorable for further development, resulting in Jelawat steadily strengthening and gaining organization before intensifying into a severe tropical storm at 18:00 UTC on March 28. Later on March 29, an eye began to emerge within a growing central dense overcast, leading to the JMA classifying it as a typhoon at 00:00 UTC on March 29.


2018 Pacific typhoon season, Systems, Typhoon Jelawat (Caloy)
Explosive intensification then ensued over the following 36 hours as the eye became sharply defined, and Jelawat attained its peak intensity later that morning, with estimated 10-minute sustained winds of 195 km/h (120 mph) and a central pressure of 915 hPa (27.02 inHg). At the same time, the JTWC assessed it as peaking with 1-minute sustained winds of 240 km/h (150 mph), making it a Category 4 super typhoon.


2018 Pacific typhoon season, Systems, Typhoon Jelawat (Caloy)
Immediately after peaking in intensity, Jelawat began weakening rapidly due to a sharp increase in wind shear and dry air, and the storm fell below typhoon strength late on March 31. During the next couple of days, Jelawat drifted to the northeast and then turned eastward before dissipating on April 1.


2018 Pacific typhoon season, Systems, Tropical Depression 04W
A low-pressure area east of Mariana Islands was upgraded to a tropical depression by the JMA late on May 10 shortly before the JTWC issued a TCFA. By May 12, deep convection was observed near its center as the JTWC began issuing advisories on the system, giving it the designation 04W. Roughly twelve hours later, it was reported that 04W had intensified into a tropical storm by the JTWC after satellite imagery had depicted a well-defined center. Tracking on a west-northwesterly course, the system began to weaken as it entered an area of unfavorable conditions. 04W rapidly weakened as the JTWC issued their final advisory on the system early on May 14 as wind shear affected the system and exposed the elongated low-level circulation. The JMA, however, tracked the system until early on May 15, when it dissipated.


2018 Pacific typhoon season, Systems, Tropical Storm Ewiniar
A low-pressure area developed into a tropical depression over the South China Sea on June 2. Later that day, the JTWC followed suit and assigned the designation 05W to the system. 05W meandered in a westward direction until it curved northward, and after three days, the JTWC upgraded the system to a tropical storm. The JMA did the same three hours later early on June 6, naming it Ewiniar. Shortly thereafter, Ewiniar made landfall over South China. Ewiniar maintained its intensity while over land until the JTWC issued its final advisory late on June 7. The JMA, however, tracked the system until early on June 9, when Ewiniar had weakened into a tropical depression and degenerated into a remnant low. However, Ewiniar's remnants moved out to sea and continued to persist, before dissipating on June 13.


2018 Pacific typhoon season, Systems, Tropical Storm Ewiniar
A total of 13 people were killed, while total damages in Mainland China were counted to be ¥5.19 billion (US$812 million).


2018 Pacific typhoon season, Systems, Severe Tropical Storm Maliksi (Domeng)
A low-pressure area northwest of Palau developed into a tropical depression late on June 3. On the next day, the system received the local name Domeng from the PAGASA as the JTWC issued a TCFA on the system. After the system had consolidated further, the JMA upgraded the system to a tropical storm, naming it Maliksi. The JTWC, however, did not track the system until 03:00 UTC on June 8 when it gave Maliksi the designation of 06W.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Maliksi (Domeng)
Moving northward, Maliksi continued to intensify until it reached its peak strength early on June 10 with winds of 110 km/h (70 mph), just shy of typhoon intensity, and a minimum pressure of 970 hPa. Operationally, the JMA briefly classified Maliksi as a typhoon, but it was downgraded to a severe tropical storm in post-analysis. Maliksi began to weaken as it began extratropical transition, and on June 11 as it encountered more unfavorable conditions, both agencies stopped issuing warnings on Maliksi as the system's center became exposed and as it transitioned into an extratropical cyclone. The JMA tracked the remnants of Maliksi until 00:00 UTC on June 13.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Maliksi (Domeng)
Despite not making landfall on the Philippines, Maliksi prompted the PAGASA to declare the official start of the rainy season on June 8, 2018. Two people were killed by heavy monsoonal rains enhanced by Maliksi in the Philippines.


2018 Pacific typhoon season, Systems, Subtropical Storm 07W
A disturbance formed southwest of Taiwan on June 12 just within the meiyu front, and the JTWC subsequently indicated the formation of a subtropical depression. At 21:00 UTC on June 13, the JTWC issued its first advisory on the system and designated it as 07W, classifying it as a tropical depression. Despite being affected by moderate to severe wind shear, the system was located over relatively warm sea-surface temperatures as it produced patches of convection, and this prompted the JTWC to upgrade 07W to a tropical storm.


2018 Pacific typhoon season, Systems, Subtropical Storm 07W
The JTWC later issued their fourth but final advisory on 07W at 15:00 UTC on June 14 when the system was rapidly undergoing a phase of extratropical transition and as the system was rapidly losing its structure. 07W fully became an extratropical cyclone just to the south of mainland Japan at 06:00 UTC on June 15, although its remnant was still tracked until June 25, when the system was last located near the coast of British Columbia.


2018 Pacific typhoon season, Systems, Tropical Storm Gaemi (Ester)
On June 13, a tropical depression formed on the South China Sea from the trough of 07W. On June 14, the PAGASA announced it had entered the Philippine Area of Responsibility, assigning it the local name Ester. Tropical Depression Ester (08W) made landfall on Taiwan by midnight, and after emerging off the coast, it was assigned the name Gaemi by the JMA. On June 16, Gaemi transitioned into an extratropical cyclone. On June 19, the NDRRMC reported that 3 people had died from monsoonal rains enhanced by Gaemi. Agricultural damage in Okinawa Prefecture were estimated at ¥84.58 million (US$764,000).


2018 Pacific typhoon season, Systems, Typhoon Prapiroon (Florita)
A low-pressure area west of Okinotorishima developed into a tropical depression on June 28. On the next day, the PAGASA began issuing advisories, assigning it the local name Florita. 6 hours later, Florita became a tropical storm, with the JMA assigning it the name Prapiroon. By July 2, Prapiroon intensified into a Category 1 typhoon as it neared Japan and Korea. By July 3, Prapiroon had attained peak intensity. On the same day, Prapiroon made landfall on Japan. After making landfall, Prapiroon briefly weakened to a tropical storm. Prapiroon became a low-pressure area on the next day, though the JMA still tracked its remnants until July 10, when it finally dissipated.


2018 Pacific typhoon season, Systems, Typhoon Prapiroon (Florita)
As of July 2018, 1 person from South Korea was killed by the storm. Agricultural damage in Okinawa Prefecture were about ¥49.39 million (US$446,000).


2018 Pacific typhoon season, Systems, Typhoon Maria (Gardo)
A tropical disturbance formed over the Marshall Islands late on June 26. After slow development and as it drifted westward for five days, the Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert early on July 2 and upgraded the system to a tropical depression, designating it 10W late on the same day. Early on July 3, the Japan Meteorological Agency upgraded the low-pressure area into a tropical depression southeast of Guam and subsequently started to issue tropical cyclone warnings.


2018 Pacific typhoon season, Systems, Typhoon Maria (Gardo)
Favorable environmental conditions, including moderate vertical wind shear, poleward outflow enhanced by tropical upper tropospheric trough (TUTT) cells located to the northeast and to the northwest, sea surface temperatures between 30 and 31 °C, were contributing to the development of the system on July 4. As a result, the system continued to organize and the JMA upgraded it to a tropical storm and assigned it the international name Maria at around 12:00 UTC, with the JTWC also upgrading it to a tropical storm. Six hours later, when the storm struck Guam directly, surface observations at Andersen Air Force Base recorded one-minute maximum sustained winds of 50 knots (93 km/h; 58 mph) and a minimum pressure of 984 hPa (29.06 inHg), indicating a rapidly consolidating system.


2018 Pacific typhoon season, Systems, Typhoon Maria (Gardo)
On July 5, Maria drifted northwestward slowly under the influences of a weak north-south oriented steering ridge and a strong east-west oriented subtropical ridge entrenched to the north. After being upgraded to a severe tropical storm by JMA and a typhoon by JTWC early on the same day, Maria began undergoing extremely rapid intensification due to highly favorable conditions, intensifying from a tropical storm to a Category 5 on the Saffir–Simpson scale in under 24 hours. Microwave imagery revealed an eye and the JMA upgraded Maria to a typhoon in the afternoon.


2018 Pacific typhoon season, Systems, Typhoon Maria (Gardo)
The JTWC upgraded Maria to a super typhoon and reported that it reached its initial peak intensity with one-minute maximum sustained winds of 260 km/h (160 mph) at around 00:00 UTC on July 6, making it the first Category 5-equivalent tropical cyclone in the northern hemisphere since Hurricane Maria in September 2017, and the first in the western Pacific since Typhoon Nock-ten. At around 01:10 UTC on July 11, Maria made landfall over the Huangqi Peninsula of Lianjiang County, Fuzhou in Fujian, China with ten-minute maximum sustained winds of 155 km/h (100 mph) and a central pressure of 955 hPa (28.20 inHg).


2018 Pacific typhoon season, Systems, Typhoon Maria (Gardo)
When it made landfall in East China on July 10, it soaked Southern Japan and killed 1 person. Total damages in Mainland China were estimated to be CN¥4.16 billion (US$623 million).


2018 Pacific typhoon season, Systems, Tropical Storm Son-Tinh (Henry)
An area of low-pressure strengthened into a tropical depression on July 15 to the northwest of Manila, Philippines. The JTWC designated it as 11W while the PAGASA gave it the local name Henry. As the system moved fast in a westward direction, the system gradually intensified and was declared a tropical storm on July 17, with the JMA naming it as Son-Tinh as its convective structure improved. Thereafter, Son-Tinh slightly weakened as it neared Hainan Island while experiencing moderate shear.


2018 Pacific typhoon season, Systems, Tropical Storm Son-Tinh (Henry)
During the next day, however, Son-Tinh slightly intensified over the Gulf of Tonkin due to warm sea-surface temperatures before it made landfall on northern Vietnam. Both agencies issued their final warnings on Son-Tinh on July 19 as the system had weakened back into an area of low-pressure embedded into the monsoon. However, the JTWC continued to track the system's remnants for another two days before it dissipated.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Ampil (Inday)
On July 17, a weak tropical depression developed over the Philippine Sea. The JTWC upgraded the system to a tropical depression on the same day, designating it as 12W as it was located over a favorable environment. On the next day, the PAGASA followed suit and it was given the local name Inday. By 12:00 UTC on July 18, the JMA upgraded the system to a tropical storm, assigning it the name Ampil. As Ampil moved in a northward direction, the system's structure had broadened, being accompanied by sustained deep convection.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Ampil (Inday)
Despite unfavorable ocean heat content, Ampil still remained over relatively warm sea surface temperatures with the inclusion of extensive deep convection, therefore Ampil was classified as a severe tropical storm. With an improved convective system, the JTWC assessed that Ampil had reached maximum 1-minute sustained winds of 95 km/h (60 mph). Ampil reached its peak intensity with a minimum pressure of 985 hPa and maintained that intensity for the next few days as the track of Ampil changed direction. On July 21, the system's center became exposed as the system slightly weakened.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Ampil (Inday)
On the next day, the JMA downgraded Ampil back to a tropical storm as it made landfall on China with a lack of convection. Ampil weakened further to a tropical depression on July 23, and both agencies issued their final advisories on the system. The JMA continued tracking the system until it weakened into an area of low pressure at 18:00 UTC on July 24.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Ampil (Inday)
Heavy rain in Shandong Province—accumulating to 237 mm (9.3 in) in Tianjin—caused significant flooding, inundating 31,600 hectares of crops and affecting 260,000 people. One person was killed in China and total economic losses reached CN¥1.63 billion (US$241 million).


2018 Pacific typhoon season, Systems, Tropical Depression 13W (Josie)
A tropical depression formed in the South China Sea on July 20 according to the JMA. On July 21, the system entered the Philippine Area of Responsibility and was assigned the local name Josie, making it the 10th named storm to enter the PAR. The JTWC upgraded the system to a tropical storm on the same day. The system missed landfall within kilometers on Saud, Ilocos Norte. It moved north and exited the PAR on the next day. The remnants of 13W dissipated off the coast of China.


2018 Pacific typhoon season, Systems, Tropical Depression 13W (Josie)
After the formation of the previous two systems, the southwest monsoon had been extremely active in the Philippines. By August 1, a total of 16 people had been killed due to extreme flooding, while damages have been recorded at ₱4.66 billion (US$87.4 million). The southwest monsoon had been active since Typhoon Maria. July had 5 days of class suspensions in Metro Manila, making it the second in history since Typhoon Ketsana struck Metro Manila and caused ocean-high flooding since 2009.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Wukong
Late on July 21, the JTWC began to issue advisories on Tropical Depression 14W as it developed about 603 km (381 mi) east-southeast of the Japanese island of Minami-Tori-shima. The JMA began tracking the system on the early hours of July 22. Later that day, the JTWC upgraded 14W to a tropical storm, though convection was sheared and the system was located in unfavorable southwesterly shear. Within the next 24 hours, 14W began to organize with deep convection obscuring its LLCC, and at 12:00 UTC on July 23, the JMA upgraded the system to a tropical storm, naming it Wukong.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Wukong
Moving poleward, Wukong gradually intensified while entering an area of favorable environment with lesser shear, and at 00:00 UTC on July 25, the JMA upgraded Wukong to a severe tropical storm. Nine hours later, the JTWC upgraded Wukong to a Category 1 typhoon after satellite images depicted a 30-nmi ragged eye. By July 26, both the JMA and the JTWC issued their final advisories on Wukong as the system rapidly transitioned into an extratropical cyclone. Wukong's extratropical remnants were tracked until late on July 27 when it was last noticed off the eastern coast of Russia Far East.


2018 Pacific typhoon season, Systems, Typhoon Jongdari
A tropical disturbance formed southeast of Guam on July 19 and tracked westward steadily. After issuing a Tropical Cyclone Formation Alert on July 21, the Joint Typhoon Warning Center (JTWC) upgraded the system to a tropical depression early on July 22, although the location of its low-level circulation center was not clear. The Japan Meteorological Agency (JMA), however, kept reporting it as a low-pressure area until it was upgraded to a tropical depression late on July 23.


2018 Pacific typhoon season, Systems, Typhoon Jongdari
After slow consolidation for several days, the system was upgraded to a tropical storm near Okinotorishima at around 18:00 on July 24 by the JMA and the JTWC, being assigned the international name Jongdari. Microwave imagery revealed a low-level eyewall forming on the next day, indicating a consolidating system. After the JMA upgraded Jongdari to a severe tropical storm at noon, the system accelerated northeastward under the influence of a near-equatorial ridge to the south.


2018 Pacific typhoon season, Systems, Typhoon Jongdari
On July 26, as Jongdari started to interact with an upper-level cold-core low to the north which significantly enhanced poleward outflow, it intensified to a typhoon in the afternoon despite increasingly unfavorable vertical wind shear. Over the warm sea surface temperatures between 29 to 30 °C (84 to 86 °F) near the Ogasawara Islands, JMA reported that Jongdari had reached peak intensity at 00:00 UTC on July 27, with ten-minute maximum sustained winds of 140 km/h (85 mph) and a minimum central pressure of 965 hPa (28.50 inHg).


2018 Pacific typhoon season, Systems, Typhoon Jongdari
Although the JTWC indicated Jongdari reached peak intensity at 12:00 UTC with one-minute maximum sustained winds of 175 km/h (110 mph), the rugged eye of Jongdari remained periodically visible with an elongated structure due to further interaction of the upper-level low which had moved to the northwest side of the typhoon. As the steering influence transitioned to a subtropical ridge to the northeast, Jongdari executed a counter-clockwise turn to the southeast of Japan.


2018 Pacific typhoon season, Systems, Typhoon Jongdari
Jongdari began to be inundated by subsidence on July 28 as the Fujiwhara effect had made the upper-level low move to the west of the typhoon. It also initiated a weakening trend while accelerating northwestward and then westward toward the Japanese island of Honshu. At around 01:00 JST on July 29 (16:00 UTC July 28), Jongdari made landfall over Ise, Mie Prefecture with ten-minute maximum sustained winds of 120 km/h (75 mph) and a central pressure of 975 hPa (28.79 inHg).


2018 Pacific typhoon season, Systems, Typhoon Jongdari
The storm weakened rapidly inland before making its second landfall over Buzen, Fukuoka Prefecture, at around 17:30 JST (08:30 UTC), with ten-minute sustained winds of 75 km/h (45 mph) and a central pressure of 992 hPa (29.29 inHg). At around 10:30 CST (02:30 UTC) on August 3, Jongdari made landfall over Jinshan District, Shanghai as a tropical storm. Jongdari rapidly weakened after landfall, dissipating on the next day. No fatalities were recorded for this storm.


2018 Pacific typhoon season, Systems, Tropical Depression 16W
A tropical disturbance developed about 807 km (503 mi) north-northeast of Iwo To by July 29. The JTWC upgraded the system to Tropical Depression 16W during the next day after its convective structure had slightly improved despite the system located in moderate to strong wind shear. By July 31, the JMA followed suit on classifying the system as a tropical depression. 16W's center late became exposed with deep convection displaced due to continued shear.


2018 Pacific typhoon season, Systems, Tropical Depression 16W
Originally, the system was forecast to reach tropical storm intensity with only 35 knot winds, but the system's center had become asymmetric with a fully sheared center. The JTWC issued their final advisory on 21:00 UTC of the same day, after 16W had fully transitioned into a subtropical cyclone, though both agencies continued to track the system until August 2.


2018 Pacific typhoon season, Systems, Typhoon Shanshan
A tropical depression developed east-northeast of Guam on August 2. At 21:00 UTC on the same day, the JTWC began tracking the system, giving it the identifier 17W. 17W intensified into a tropical storm on August 3, with the JMA assigning it the name Shanshan. The storm was located over a favorable environment as the system was gradually consolidating, and it intensified into a severe tropical storm on August 3. During the next day, both the JMA and JTWC upgraded Shanshan to a typhoon after deep convection was seen wrapping into its developing center.


2018 Pacific typhoon season, Systems, Typhoon Shanshan
The JMA later analysed that the storm had peaked in intensity with 10-minute winds of 130 km/h (80 mph) and a minimum pressure of 970 hPa, remaining that intensity for several days. The JTWC stated that Shanshan had slightly weakened after a strengthening trend by August 6 after its eye became ragged and slightly displaced. On August 7, Shanshan began to re-intensify and reached its peak strength as a Category 2 typhoon with 1-minute winds of 165 km/h (105 mph) while nearing southeastern Japan. Thereafter, Shanshan began to change its course towards the east as it rapidly weakened. The JTWC issued their final advisory on August 9, though the JMA tracked the system until it became extratropical at 06:00 UTC on August 10.


2018 Pacific typhoon season, Systems, Typhoon Shanshan
Losses in Miyagi Prefecture were counted at ¥96.2 million (US$866,000).


2018 Pacific typhoon season, Systems, Tropical Storm Yagi (Karding)
A tropical disturbance had persisted towards the southwest of Iwo To on August 1. After the course of five days, the system was upgraded into a tropical depression by the JMA, with the JTWC following suit several hours later, designating it as 18W. The PAGASA also began issuing bulletins on the system, assigning it the local name Karding. Karding maintained its intensity as a tropical depression due to moderate to strong easterly shear despite persistent convection surrounding the system. By August 8, a METOP-


2018 Pacific typhoon season, Systems, Tropical Storm Yagi (Karding)
A ASCAT image showed that the system had winds of 35 knots, which prompted the JTWC to upgrade it to a tropical storm. The JMA around the same time did the same, assigning it the name Yagi. Within the next day, Yagi curved towards the northwest, struggling to intensify due to wind shear. At 12:00 UTC on August 11, the JMA estimated that Yagi reached its peak strength with 10-minute winds of 75 km/h (45 mph) and a minimum pressure of 990 hPa.


2018 Pacific typhoon season, Systems, Tropical Storm Yagi (Karding)
The JTWC declared that Yagi reached winds of 85 km/h (50 mph) at 12:00 UTC on August 12 after the storm had consolidated further with an improved structure. Yagi made landfall shortly thereafter over Wenling, in Taizhou of Zhejiang, China, at around 23:35 CST (15:35 UTC) on August 12. By 21:00 UTC of that day, the JTWC issued their final advisory on Yagi, though they continued to track it until it weakened further into a tropical depression early on August 13. The JMA did the same on 06:00 UTC of August 13. The JMA tracked Yagi until it became an extratropical system on August 15.


2018 Pacific typhoon season, Systems, Tropical Storm Yagi (Karding)
Despite not making landfall on the Philippines, the storm enhanced the southwest monsoon which brought extreme flooding to many regions within the country. According to the NDRRMC, 5 people died along with ₱996 million (US$19 million) worth of damages. In East China, Yagi killed a total of 3 people and total damages were counted to be CN¥2.51 billion (US$367 million).


2018 Pacific typhoon season, Systems, Tropical Storm Bebinca
On August 9, a tropical depression formed within the South China Sea. The system remained weak and remained stationary for a few days until the JTWC began tracking the system, giving it the designation 20W on August 12. On the next day, the JMA upgraded the system to a tropical storm, naming it Bebinca. The JTWC followed suit nine hours later as deep convection flared near its compact center. Despite consistent convection along with warm sea-surface temperatures, Bebinca remained weak for the next few days due to strong shear.


2018 Pacific typhoon season, Systems, Tropical Storm Bebinca
By August 16, however, Bebinca began to undergo a phase of rapid intensification as its center was obscured by a central dense overcast, which resulted in the JMA briefly upgrading Bebinca to a severe tropical storm, though in post-analysis it was downgraded to a tropical storm. The JTWC analysed a few hours later that the system had reached peak intensity with 1-minute winds of 110 km/h (70 mph). After Bebinca made landfall, the system rapidly weakened and both agencies issued their final warnings on August 17, with the system fully dissipating on the same day.


2018 Pacific typhoon season, Systems, Tropical Storm Bebinca
Bebinca killed a total of 6 people, and total economic losses in South China were counted to be ¥2.31 billion (US$333 million). 13 people lost their lives in Vietnam and total damages were counted to be ₫786.55 billion (US$33.7 million).


2018 Pacific typhoon season, Systems, Severe Tropical Storm Leepi
On August 10, a tropical depression formed near the Mariana Islands, and on the next day at 12:00 UTC, the JMA upgraded it to a tropical storm, assigning it the name Leepi. By August 13, Leepi began to threaten Japan, and on August 14, Leepi intensified into a severe tropical storm, with the JTWC upgrading it to a typhoon. Shortly before 03:00 JST (18:00 UTC) on August 15, Leepi made landfall over Hyūga, Miyazaki in Japan. Leepi was downgraded into a tropical depression and dissipated on August 15, though its remnants were still noted near Russia.


2018 Pacific typhoon season, Systems, Tropical Storm Hector
On August 13 at 18:00 UTC, both the JMA and the JTWC declared that Tropical Storm Hector has crossed the International Date Line and entered the West Pacific basin from the East Pacific basin. At this point, Hector was still located in a favorable environment with only moderate shear, though deep convection was limited as it only persisted just near its center. Due to an upper tropospheric trough cell located to the west of Hector, the storm failed to intensify and began to weaken.


2018 Pacific typhoon season, Systems, Tropical Storm Hector
The JTWC downgraded Hector to a tropical depression after the system rapidly entered an area of high vertical wind shear. By the early hours of August 15, both agencies issued their final warnings on Hector, mentioning that Hector's low-level circulation had become elongated and that the storm already transitioned into a subtropical cyclone. The JMA, however, continued to monitor the system until 00:00 UTC on August 17.


2018 Pacific typhoon season, Systems, Tropical Storm Rumbia
On August 15, a tropical depression in the East China Sea intensified into a tropical storm, being given the name Rumbia by the JMA. Shortly after reaching peak intensity over the Hangzhou Bay on August 16, Rumbia made landfall over Pudong New Area, Shanghai, China at around 04:05 CST on August 17 (20:05 UTC), becoming the third tropical storm to hit Shanghai in 2018.


2018 Pacific typhoon season, Systems, Tropical Storm Rumbia
Rumbia killed a total of 53 people in East China and total economic losses were counted to be CN¥36.91 billion (US$5.36 billion). Shouguang received 174.7 mm (6.88 in) of rain and was particularly hard-hit, with 10,000 homes destroyed and 13 people killed. The city is regarded as the nation's greatest producer of vegetables and agriculture suffered tremendous losses; 200,000 greenhouses sustained damage. Upstream on the Mi River rainfall reached 241.6 mm (9.51 in) and caused significant flooding. Water levels at three reservoirs rose dangerously high, prompting officials to release excess water to avoid collapse. The resulting increase downstream exacerbated the flooding in Shouguang. The extratropical remnants of Rumbia were last tracked northeast of Hokkaido before dissipating off the coast of the Russian Far East.


2018 Pacific typhoon season, Systems, Typhoon Soulik
A low-pressure area in the Philippine Sea organized into a tropical depression late on August 15. The JTWC followed suit at 00:00 UTC at August 16 and was designated as 22W. Later on that day, the JMA upgraded 22W to tropical storm and it was given the international name Soulik. On August 17, JMA upgraded Soulik to a typhoon, marking the sixth typhoon of the season. Then Soulik rapidly intensified onto a severe typhoon, and on the next day, Soulik reached its peak intensity, with winds of 165 km/h (103 mph), and remained that intensity for several days. It also began to display some annular characteristics. After passing the Ryukyu Islands early on 22 August, the storm gradually weakened due to low sea-surface temperatures. On August 23, Soulik made landfall over Haenam County, South Jeolla Province of South Korea at around 23:00 KST (14:00 UTC).


2018 Pacific typhoon season, Systems, Typhoon Soulik
Total damage in South Korea were at ₩50.7 billion (US$45 million). Economic loss in Northeast China were counted to be CN￥550 million (US$79.9 million). Flooding in North Korea triggered by Soulik killed 86 people.


2018 Pacific typhoon season, Systems, Typhoon Cimaron
On August 17, a tropical depression formed near the Marshall Islands. It was named Tropical Storm Cimaron a day later. Soon after, it was upgraded to a Severe Tropical Storm. Cimaron gradually intensified over the course from August 20–22. Typhoon Cimaron threatened Southern Japan, at the same time as Typhoon Soulik ravaged the area. Typhoon Cimaron intensified to reach its peak intensity at Category 4 severe typhoon with 130 mph winds before its landfall on Japan on August 23 over the southern part of Tokushima Prefecture, Japan at around 21:00 JST (12:00 UTC).


2018 Pacific typhoon season, Systems, Typhoon Cimaron
Typhoon Cimaron emerged off the north coast as a weak tropical storm, before becoming extratropical and headed into Northern Japan again. Cimaron was a significant Category 4 storm, and the 12th typhoon to strike Japan in 2018 and was surpassed by Typhoon Jebi a month later. Then, it made landfall over Himeji, Hyōgo Prefecture shortly before 24:00 JST (15:00 UTC).


2018 Pacific typhoon season, Systems, Typhoon Cimaron
Agricultural damage in Kyoto, Wakayama and Shiga Prefecture were about JP¥3.41 billion (US$30.6 million).


2018 Pacific typhoon season, Systems, Tropical Depression 24W (Luis)
A tropical depression formed at the South China Sea near Taiwan. Despite entering an area of high wind shear, the system was in a favorable environment, so the JTWC and the PAGASA followed suit, with the JTWC naming it 24W, and the PAGASA named it Luis. 24W then made landfall over Fujian, China shortly after 08:00 CST (00:00 UTC) on August 25, and degenerated into a low-pressure area on next day. The JMA would continue monitoring the system until the next day.


2018 Pacific typhoon season, Systems, Tropical Depression 24W (Luis)
Tropical Depression 24W killed 7 people and damages of NT$1.022 billion (US$34 million) in Taiwan.


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
A low-pressure system formed near the Marshall Islands on early August 25, developing and being upgraded to a tropical depression on August 27 by the Japan Meteorological Agency (JMA). There was a persistent deep convection in the system which lead to the upgrade to a tropical storm by the JMA and was given the name 'Jebi'. On August 29, the storm abruptly underwent rapid intensification and became the third super typhoon and the second category 5 of the season.


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
On September 4, a weakened but still powerful Jebi made landfall over the southern part of Tokushima Prefecture at around 12:00 JST (03:00 UTC) before moving over Osaka Bay and making another landfall at around Kobe, Hyōgo Prefecture at around 14:00 JST (05:00 UTC). Osaka was hit badly with a maximum wind gust of 209 km/h recorded at Kansai International Airport and 171 km/h at Osaka city's weather station, where the minimum sea level pressure (962 mb) was the lowest since 1961's record of 937 mb (Typhoon Nancy) and the fifth lowest on record.


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
A 3.29 metre storm surge led to flooding along the Osaka Bay, including Kansai International Airport, where the runways were flooded and some airport facilities were damaged by wind and water. Osaka's iconic Universal Studios Japan was also closed during the event of the typhoon. Wakayama also recorded a maximum wind gust of 207 km/h. Jebi then moved over Kyoto which wrecked more havoc. Multiple shrines were closed during the duration of the typhoon. Kyoto Station received a lot of damage, the glass above the atrium covering the central exit, shops and hotel, collapsed, narrowly missing a few by centimeters.


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
The typhoon ultimately emerged into the Sea of Japan shortly after 15:00 JST (06:00 UTC). Simultaneously, a cold front formed southwest of the typhoon, initiating the beginning of an extratropical transition on September 4. On September 5, after JTWC issued a final warning at 00:00 JST (15:00 UTC), Jebi was downgraded to a severe tropical storm at 03:00 JST (18:00 UTC) when it was located near the Shakotan Peninsula of Hokkaido. The storm completely transitioned into a storm-force extratropical cyclone off the coast of Primorsky Krai, Russia shortly before 10:00 VLAT (09:00 JST, 00:00 UTC).


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
Later, the extratropical cyclone moved inland. The terrain of Khabarovsk Krai contributed to the steadily weakening trend as the system moved inland northwestward and then northward; extratropical low passed northeast of Ayan early on September 7. Jebi's extratropical remnant continued northward and then turned northeastward, before dissipating early on September 9 over the Arctic Ocean.


2018 Pacific typhoon season, Systems, Typhoon Jebi (Maymay)
Jebi was the strongest storm to hit Japan since Typhoon Yancy of 1993. In total, Jebi killed 17 people and inflicted around US$15 billion. 11 deaths were reported from Japan and 6 deaths were reported from Taiwan.


2018 Pacific typhoon season, Systems, Typhoon Mangkhut (Ompong)
On September 6, a tropical depression formed near the Marshall Islands. However, operationally, the Japan Meteorological Agency (JMA) did not initiate advisories on the system until September 7. The JTWC followed suit at 03:00 UTC on September 7, and classified the system as 26W. Late on the same day, the system strengthened into a tropical storm, and the JMA named the system Mangkhut. By September 11, Mangkhut became a typhoon, and made landfall on the islands of Rota, Northern Mariana Islands.


2018 Pacific typhoon season, Systems, Typhoon Mangkhut (Ompong)
On September 12, at 3 pm Philippine Standard Time, Mangkhut entered the PAR as a Category 5 super typhoon, and accordingly, PAGASA named the storm Ompong. The JTWC noted additional strengthening on September 12, and assessed Mangkhut to have reached its peak intensity at 18:00 UTC, with maximum one-minute sustained winds of 285 km/h (180 mph). On September 13, the Philippine Government initiated evacuations for residents in the typhoon's expected path. Late on September 14, Mangkhut made landfall on the Philippines as a Category 5-equivalent super typhoon, with 1-minute sustained winds of 165 miles per hour (266 km/h).


2018 Pacific typhoon season, Systems, Typhoon Mangkhut (Ompong)
While moving inland, Mangkhut weakened into a strong Category 4-equivalent super typhoon, and soon weakened further into a Category 2 typhoon. A large eye then appeared and the system slowly strengthened into a Category 3 typhoon, as the storm moved over Hong Kong. As Mangkhut made its final landfall, it weakened into a weak Category 1 typhoon and maintained its intensity inland with deep convection, before subsequently weakening further. Late on September 17, Mangkhut dissipated over Guangxi, China.


2018 Pacific typhoon season, Systems, Typhoon Mangkhut (Ompong)
As of September 23, at least 134 fatalities have been attributed to Mangkhut, including 127 in the Philippines, 6 in mainland China, and 1 in Taiwan. As of October 5, the NDRRMC estimated that Mangkhut caused ₱33.9 billion (US$627 million) in damages in the Philippines, with assessments continuing.


2018 Pacific typhoon season, Systems, Tropical Storm Barijat (Neneng)
On September 8, a tropical depression formed near Batanes in the Philippines. The storm was named Tropical Depression Neneng by PAGASA, with Batanes placed under TCWS #1. By the next day, Neneng exited the PAR and became a tropical storm, with the JMA assigning the name Barijat to the storm, while TCWS were raised in the absence of the storm. Over the next 2 days, Tropical Storm Barijat moved westward across the South China Sea, reaching its peak intensity with 10-minute maximum sustained wind speeds of 85 km/h on the night of September 11.


2018 Pacific typhoon season, Systems, Tropical Storm Barijat (Neneng)
On September 13, Tropical Storm Barijat (Neneng) made landfall on the Leizhou Peninsula, near the area where Tropical Storm Son-tinh (Henry) had made landfall 2 months ago, before making a second landfall on northern Vietnam later on the same day. During the evening of September 13, Barijat became a remnant low, dissipating on the next day.


2018 Pacific typhoon season, Systems, Tropical Storm Barijat (Neneng)
Tropical Storm Barijat made a dozen landslides over Batanes, which increased the risk of major landslides and major flooding in the saturated soil influenced by this storm and later by Mangkhut (Ompong). Damages in China were at ¥50 million (US$7.3 million).


2018 Pacific typhoon season, Systems, Typhoon Trami (Paeng)
On September 19, the NRL began to monitor a large tropical disturbance that formed near Chuuk in the Federated States of Micronesia. The system drifted westwards and strengthened into a tropical depression on September 20 according to the JMA, while the JTWC issued a TCFA. Trami managed to find itself in favorable conditions for strengthening and on September 21, it gained tropical storm status and was named Trami. On September 22, Trami still strengthened and became a Severe Tropical Storm before strengthening to a Category 1 typhoon.


2018 Pacific typhoon season, Systems, Typhoon Trami (Paeng)
On September 23, Trami, yet again in favorable conditions, continued to strengthen and became a Category 3-equivalent typhoon while undergoing an eyewall replacement cycle at the same time. Early on September 24, Trami strengthened further and attained Category 4 super typhoon status once it finished its eyewall replacement cycle. At 18:00 UTC on September 24, Trami strengthened even further and subsequently became a Category 5 super typhoon. On its route to Okinawa, Japan, Trami slowed down considerably and was almost stationary before moving north-northeastward.


2018 Pacific typhoon season, Systems, Typhoon Trami (Paeng)
During this period of time, another eyewall replacement cycle that eventually failed later on, coupled with decreasing sea surface temperatures, started to slowly weaken Trami, although it still remained an organized storm. On September 30, Trami reached the most organized point of its duration after its peak, but Trami's structure started to deteriorate afterward, and the storm's winds gradually dropped as Trami resumed weakening. The typhoon made landfall over Tanabe, Wakayama Prefecture at around 20:00 JST (11:00 UTC) on September 30 as a Category 2-equivalent typhoon.


2018 Pacific typhoon season, Systems, Typhoon Trami (Paeng)
The storm's structure deteriorated rapidly after landfall, and the JMA issued their last advisory on Trami on October 1. After Trami impacted Honshu, it completely transitioned into a hurricane-force extratropical cyclone and impacted the Kuril Islands and weakened to a storm-force system. Its extratropical remnants were last tracked in the Bering Sea, near the Aleutian Islands.


2018 Pacific typhoon season, Systems, Typhoon Trami (Paeng)
Agricultural damage in Japan were at ¥61.65 billion (US$542 million).


2018 Pacific typhoon season, Systems, Tropical Depression 29W
On September 25, a tropical depression formed to the southeast of Japan. The JTWC gave the system the designation 29W on next day. However, Tropical Depression 29W remained a weak system, and developed an exposed low-level circulation center later that day. Afterward, the tropical depression accelerated northward and then north-northeastward, until it was eventually absorbed into a developing extratropical cyclone east of Japan on September 27.


2018 Pacific typhoon season, Systems, Typhoon Kong-rey (Queenie)
In late September, a tropical disturbance formed in the waters near Pohnpei Island in the Federated States of Micronesia. The Joint Typhoon Warning Center also gave the storm, Invest 94W, a low chance of development. Over the next couple of days, the system moved westward and organized into a tropical depression on September 27, and the JMA initiated advisories on the storm, while the JTWC issued a TCFA. On September 28, the JTWC designated the system as 30W, while the JMA issued a gale warning for the system.


2018 Pacific typhoon season, Systems, Typhoon Kong-rey (Queenie)
As Tropical Depression 30W continued strengthening, the system became a tropical storm and was named Kong-rey by the JMA. On September 29, the system moved further west, found itself in favorable conditions for strengthening, and became a tropical storm. Later that day, Kong-rey strengthened into a severe tropical storm, and on September 30, the storm attained typhoon status at 03:00 UTC. Kong-rey continued strengthening, and at 18:00 UTC on October 1, Kong-rey became a Category 4-equivalent super typhoon. Early on October 2, Kong-rey strengthened into a Category 5 super typhoon.


2018 Pacific typhoon season, Systems, Typhoon Kong-rey (Queenie)
Affected by vertical wind shear, low ocean heat content and decreasing sea surface temperatures, the storm gradually weakened to a Category 3 typhoon on October 3 while undergoing an eyewall replacement cycle. Increased vertical wind shear and lower sea surface temperatures hampered Kong-rey's strength, and Kong-rey was downgraded to a tropical storm on October 4. Early on October 6, Kong-rey made landfall in Tongyeong, South Gyeongsang Province in South Korea as a high-end tropical storm, and later on the same day, Kong-rey transitioned into an extratropical cyclone, while impacting southern Hokkaido, such as areas near Hakodate.


2018 Pacific typhoon season, Systems, Typhoon Kong-rey (Queenie)
As of October 2018, 3 people have been killed by the storm, including 2 people from South Korea. Damage nationwide totaled at ₩54.9 billion (US$48.5 million). Although Kong-Rey did not make a direct landfall on Kyushu and Shikoku, its outer rainbands affected the two islands. At an area in Shikoku, rain accumulated to 300 mm. In Nagasaki, more than 12,000 families lost power; in Fukuoka Prefecture, a person died because of the rain. Agricultural damage in Okinawa and Miyazaki Prefecture were about JP¥13.99 billion (US$123 million).


2018 Pacific typhoon season, Systems, Typhoon Kong-rey (Queenie)
Unrelated to Kong-rey, Hurricane Walaka was a Category 5 hurricane at the same time Kong-rey intensified to Category 5 super typhoon intensity, marking the first time since 2005 when two tropical cyclones of Category 5 strength existed simultaneously in the Northern Hemisphere.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
Early on October 21, a tropical depression developed to the east of Guam and the Northern Mariana Islands, with the JMA initiating advisories on the system. Shortly afterward, the JTWC assigned the storm the identifier 31W. The system began to strengthen, becoming a tropical storm several hours later, and the JMA named the system Yutu. Favorable conditions, including low wind shear and high ocean-surface temperatures, allowed Yutu to explosively intensify on the following day, with the storm reaching severe tropical storm strength and then typhoon intensity a few hours later.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
From October 23 to 24, Yutu continued to organize and explosively intensify, reaching Category 5 super typhoon intensity on October 24. The typhoon continued to strengthen and displayed a healthy convective structure, while moving towards the island of Saipan. Later on the same day, Typhoon Yutu made landfall on the island of Tinian, just south of Saipan, at Category 5 intensity, with 1-minute sustained winds of 285 km/h (175 mph), becoming the most powerful storm on record to impact the northern Mariana Islands.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
After making landfall on Tinian, Yutu underwent an eyewall replacement cycle, which it successfully completed on the next day, and the storm strengthened back to Category 5 super typhoon status on October 26, at 15:00 UTC.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
On October 27, Yutu's eye became cloud-filled, indicative of weakening, and the storm weakened to a Category 4 super typhoon. On the same day, the storm entered PAGASA's area of responsibility, and Yutu was given the name Rosita by PAGASA. On October 28, Yutu quickly weakened, as ocean sea-surface heat content significantly declined.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
After making landfall on October 30, Yutu rapidly weakened, and when it emerged over the South China Sea, low ocean heat content and westerly wind shear caused Yutu to weaken below typhoon status. On November 2, Yutu weakened into a remnant low off the coast of China, before dissipating on the next day.


2018 Pacific typhoon season, Systems, Typhoon Yutu (Rosita)
On October 25, in Saipan, the typhoon killed a woman when it destroyed the building she was staying in, and injured 133 other people, three of whom were severely injured. On Saipan and nearby Tinian, high winds from Yutu knocked down more than 200 power poles. Most of the buildings in southern Saipan lost their roofs or were destroyed, including a high school that was wrecked.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Usagi (Samuel)
On November 3, the Central Pacific Hurricane Center began monitoring a disturbance that had formed in the Central Pacific basin. This disturbance soon moved out of the basin and into the West Pacific without further development on November 6. Tracking westward, the system did not organize until late on November 18, when it reached tropical depression status on the Saffir-Simpson scale. The PAGASA named the system Tropical Depression "Samuel" and issued warnings for Mindanao and Visayas. Samuel made landfall on November 20 in the Philippines, crossing the archipelago and weakening slightly.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Usagi (Samuel)
Samuel began to restrengthen over the South China Sea, and was subsequently named "Usagi". Usagi underwent rapid intensification, and became a severe tropical storm on November 21 while moving slowly. By November 22, Usagi (Samuel) intensified into a Category 1 typhoon. On November 24, Usagi weakened back to a severe tropical storm while heading to Vietnam because of the land interaction.


2018 Pacific typhoon season, Systems, Severe Tropical Storm Usagi (Samuel)
Usagi caused one death in the Philippines, and the agricultural damage were at ₱52.2 million (US$994,000). On November 25, Usagi made landfall on Mekong Delta. The typhoon caused flooding in Ho Chi Minh City and killed three people. Losses in Vietnam were at ₫925 billion (US$39.5 million).


2018 Pacific typhoon season, Systems, Tropical Storm Toraji
A low pressure system exited the PAR on November 15. Late on November 16, a tropical disturbance formed east of Vietnam. It slowly tracked west-northwest and strengthened into a tropical-depression strength storm early on November 17. Toraji made landfall on November 18 and quickly weakened; the remnants emerged into the Gulf of Thailand, and the remnants briefly reorganized, regaining tropical-depression strength on November 20. However, as Toraji made a second landfall on the Malay Peninsula, it weakened once more and dissipated late on November 21, due to wind shear over the Strait of Malacca.


2018 Pacific typhoon season, Systems, Tropical Storm Toraji
Toraji caused flooding in Nha Trang, resulting in 20 dead and ₫1.24 trillion (US$53.6 million) in damages.


2018 Pacific typhoon season, Systems, Typhoon Man-yi (Tomas)
On November 19, a tropical depression formed well east of the Philippines and intensified into a tropical storm soon thereafter, receiving the name Man-yi. After reaching typhoon status on November 21, Man-yi entered the Philippine basin and received the name Tomas from PAGASA. Shortly after, Man-yi intensified into a Category 2 typhoon. However, after completing an anticyclonic loop due to the influences of nearby weather systems, entering and exiting the PAR multiple times, Man-yi dipped to Category 1 status and moved into cooler waters. Succumbing to hostile conditions, Man-yi weakened into a tropical storm once more on November 25 and degenerated into a tropical depression by the end of the next day, while tracking northeast, and became an extratropical cyclone.


2018 Pacific typhoon season, Systems, Tropical Depression 35W (Usman)
A tropical depression formed in the Philippine Sea on December 25. It entered the PAR later that evening and the PAGASA named the significant tropical depression "Usman". Usman made its first landfall on Samar, Eastern Visayas on December 28. It passed over Palawan and other areas in the weekend. Usman did not survive the passage of the Philippines and degenerated into a remnant low. The remnants of 35W were absorbed by an invest on December 30 which would later become Tropical Storm Pabuk.


2018 Pacific typhoon season, Systems, Tropical Depression 35W (Usman)
While passing over the Philippines, Usman brought heavy rains that caused several landslides, which killed 156 people, with damages amounting to Php5.41 billion (US$103 million).


2018 Pacific typhoon season, Systems, Other systems
On June 4, the JMA began tracking a weak tropical depression that had formed northeast of Yap. However, the system was absorbed by a nearby tropical depression, which would eventually become Severe Tropical Storm Maliksi on the next day. After Gaemi became extratropical, a tropical depression formed south of Hong Kong early on June 17, and dissipated over the east coast of Guangdong, China one day later. On July 16, a tropical depression developed over the South China Sea. The system remained weak and moved into Vietnam, before dissipating on the next day. On August 4, the JTWC began to track a subtropical storm that had developed just west of the International Date Line; the storm subsequently became extratropical on the next day.


2018 Pacific typhoon season, Systems, Other systems
A tropical depression formed southeast of Okinawa on August 24; two days later, it made landfall over Shanghai and quickly dissipated over Jiangsu, in East China. The remnants associated with Hurricane Olivia entered this basin on September 19, and it developed into a tropical depression on September 21, while slowly drifting westward. Two days later, it degenerated into a remnant low again, as the JMA reported the system's dissipation. On September 25, the system's remnant energy developed into Tropical Depression 29W.


2018 Pacific typhoon season, Systems, Other systems
On October 19, the JMA began tracking a tropical depression in the Gulf of Thailand. On October 20, the tropical depression made landfall on the Malay Peninsula and weakened into a remnant low, before moving out of the basin.


2018 Pacific typhoon season, Systems, Other systems
A tropical depression formed over the southern portion of the South China Sea on December 31, with the JTWC designation 36W. The system intensified into Tropical Storm Pabuk on January 1, 2019, becoming the first named storm of the 2019 Pacific typhoon season.


2018 Pacific typhoon season, Storm names
Within the Northwest Pacific Ocean, both the Japan Meteorological Agency (JMA) and the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) 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).


2018 Pacific typhoon season, Storm names
PAGASA names 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 and 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.


2018 Pacific typhoon season, Storm names, International names
During the season 28 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. During the season, the names Ampil, Jongdari and Barijat were used for the first time, after they replaced the names Bopha, Sonamu and Utor which were all retired after the 2012 and 2013 seasons respectively.


2018 Pacific typhoon season, Storm names, International names, Retirement
After the season, the Typhoon Committee announced that the names Rumbia, Mangkhut, and Yutu were removed from the naming lists. They were replaced with Pulasan, Krathon, and Yinxing, respectively.


2018 Pacific typhoon season, Storm names, Philippines
During the season PAGASA used its own naming scheme for the 21 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 2014 and are scheduled to be used again during 2022.


2018 Pacific typhoon season, Storm names, Philippines
The names Gardo, Josie, Maymay, Rosita, Samuel and Usman were used for the first (and only, in the cases of Rosita and Usman) time during the year after the names Glenda, Jose, Mario, Ruby, and Seniang were retired, as both the names Ruby and Rosita were used only for the first times due its damages in the Philippines.


2018 Pacific typhoon season, Storm names, Philippines, Retirement
After the season, the names Ompong, Rosita and Usman were retired, as they caused ₱1 billion in damages. Rosita and Usman were only used for the first and last time. They were replaced with Obet, Rosal and Umberto for the 2022 season.