1997 Annual Tropical Cyclone Report

The Joint Typhoon Warning Center (JTWC) provides a variety of routine products and services to the organizations within its area of responsibility (AOR) as prescribed by USCINCPACINST 3140.1W. JTWC issues the following products: SIGNIFICANT TROPICAL WEATHER ADVISORY - Issued daily, or more frequently as needed, to describe all tropical disturbances and their potential for flirther development during the advisory period. Separate bulletins are issued for the Western Pacific and the Indian Ocean. TROPICAL CYCLONE FORMATION ALERT - Defines a specific area when synoptic, satellite, or other germane data indicate development of a significant tropical cyclone (TC) is likely within 24 hours. TROPICAL CYCLONE/TROPICAL DEPRESSION WARNING - Issued periodically throughout each day to provide forecasts of position, intensity, and wind distribution for TCs in JTWC's AOR. The tropical depression warning was dropped in 1998 as a separate product. Post-1997 tropical depressions in the western North Pacific receive regular tropical cyclone warnings.