Pacific Ocean To determine the phase of ENSO, the most recent three-month sea surface temperature average for the area approximately to the southeast of Hawaii is computed, and if the region is more than above or below normal for that period, then an El Niño or La Niña is considered in progress. In the tropical western Pacific, the monsoon and the related wet season during the summer months contrast with dry winds in the winter which blow over the ocean from the Asian landmass. Worldwide, tropical cyclone activity peaks in late summer, when the difference between temperatures aloft and sea surface temperatures
Central Weather Bureau () of the Central Weather Bureau was founded in 1989, with a mission to monitor seismic activity in and around the island, publish reports on significant earthquakes, study earthquake precursor phenomena, issue tsunami warnings where appropriate, and provide information to the public of earthquake precautions. Taiwan is in a seismically active region on the Pacific Ring of Fire, with 44 deadly earthquakes occurring there during the twentieth century. The center has 150 seismological monitoring stations through Taiwan, Penghu, Jinmen and Matsu. The Marine Meteorology Center () was established in 1993 to monitor sea conditions and make predictions about weather at