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Joint Typhoon Warning Center




JTWC adheres to the World Meteorological Organization's (WMO) rules for storm names and adheres to acknowledged guidelines for intensity of Hurricanes and Tropical Storms , with the exception of using the U.S. standard of measuring sustained winds for 1 min instead of the 10 min span recommended by the WMO (see Saffir-Simpson Hurricane Scale ).

JTWC monitors, analyzes, and forecasts tropical cyclone formation, development, and movement year round. Its area of responsibility covers more than 90% of the world's tropical cyclone activity.

The Center is currently manned by 32 U.S. Air Force and Navy personnel. The JTWC uses several satellite systems and sensors, radar, surface and upper level synoptic data as well as atmospheric models to complete its mission.

JTWC was originally established in 1959 at Nimitz Hill , Guam . It was relocated to Pearl Harbor on January 1 , 1999 due to the Base Realignment And Closure (BRAC) legislature of 1995 .


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