The CPHC's area of responsibility is the Central Pacific (CP) region, which is an administrative region, not a meteorological one. It is not a
tropical cyclone basin (a distinct area where cyclones form), but is still often referred to as the Central Pacific
basin or Central North Pacific
basin. The western edge of the area of responsibility, 180°W, is formally the
antimeridian, though this coincides with the
International Date Line for tropical latitudes, and thus these are often conflated. Meteorologically, this region covers the western part of the
Eastern Pacific basin and the eastern part of the
Western Pacific basin, though administratively the
National Hurricane Center is responsible for the Eastern Pacific
basin east of 140°W, and thus the Eastern Pacific
region (EP) typically refers to region east of 140°W, not the whole meteorological basin. The region east of 140°W was formerly the responsibility of the
Eastern Pacific Hurricane Center; like the CPHC, it took responsibility in 1970, but it is now folded into the NHC. In this area, the hurricane season lasts from June 1 through November 30. Practically, storms may form in the Eastern Pacific region (east or west of 140°W) and move west, possibly affecting Hawaii, or in the Western Pacific basin and move west, possibly affecting Asia. Smaller islands may also be affected, though this region is otherwise very sparsely populated. ==Forecasting system==