A typhoon is a mature tropical cyclone that develops in the North Western part of the Pacific Ocean between 180° and 100°E. This region is referred to as the North Western Pacific Basin. For organizational purposes, the Northern Pacific Ocean is divided into three regions: the Eastern (North America to 140°W), Central (140°W to 180°), and Western (180° to 100°E). Identical phenomena in the Eastern North Pacific are called hurricanes.When tropical cyclones move into the Western Pacific, it is re-designated as typhoons. The Regional Specialized Meteorological Center (RSMC) agreed by consensus at the World Meteorological Organization for tropical cyclone forecasts is in Japan, with other tropical cyclone warning centers for the North West Pacific being in China, Honolulu (the Joint Typhoon Warning Center), the Philippines, and Vetnam, etc. While the RSMC names each system, the main name list itself is coordinated amongst 14 countries and territories, including China, Eastern and Southeastern Asian countries and the United States, which has territories threatened by typhoons each year.
Within the North Western Pacific, there are no official typhoon seasons as tropical cyclones form throughout the year. The majority of storms are formed between June and November whilst tropical cyclone formation is at a minimum between December and May. On average, the North Western Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the subtropical high towards the west or northwest, with some systems recurving near and east of Japan. The Philippines receives the brunt of the landfalls, with China and Japan being impacted slightly less. Southern China has the longest record of typhoon impacts for the region, with a thousand year sample via documents within their archives. Taiwan has received the wettest known typhoon on record for the Northwest Pacific tropical cyclone basin.