A typhoon is a tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere. This region is referred to as the Northwestern Pacific Basin, accounting for almost one-third of the world's annual tropical cyclones. The term hurricane refers to a tropical cyclone in the northeast Pacific and northern Atlantic. For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern , central , and western . The Regional Specialized Meteorological Center for tropical cyclone forecasts is in Japan, with other tropical cyclone warning centres for the northwest Pacific in Hawaii , the Philippines, and Hong Kong. Although the RSMC names each system, the main name list itself is coordinated among 18 countries that have territories threatened by typhoons each year.