Karen destroyed the building housing the Fleet Weather Center/Joint Typhoon Warning Center. It relocated in a more typhoon-proof building in 1965. Between 1971 and 1976, CINCPAC gradually expanded out the JTWC's area of responsibility, to include the area between the International Dateline and the African coasts. In October 1978, the Fleet Weather Center/JTWC became the Navy Oceanographic Command Center/Joint Typhoon Warning Center and responsible for the whole oceanic environment, from the bottom of the ocean to the top of the atmosphere. The JTWC subsequently started issuing warnings for the Southern Hemisphere between the African coast and the International Dateline during October 1980. It was relocated to Pearl Harbor on January 1, 1999, due to the 1995 Base Realignment and Closure Commission round. During October 2011, the JTWC's name changed from the “Naval Maritime Forecast Center/Joint Typhoon Warning Center” to just the Joint Typhoon Warning Center, as it became a stand-alone command for the first time in its 52-year history. Standards and practices A more modernized method for forecasting tropical cyclones had become apparent by the 1980s. Prior to the development of ATCF, the tools used by the Department of Defense to forecast tropical cyclone track were acetate, grease pencils, and disparate computer programs. The ATCF software was developed by the Naval Research Laboratory for the JTWC beginning in 1986, and used since 1988. It was adapted for use at the National Hurricane Center (NHC) in 1990. JTWC adheres to the World Meteorological Organization's (WMO) rules for storm names and adheres to acknowledged guidelines for intensity of tropical cyclones 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). The JTWC is not one of the WMO designated Regional Specialized Meteorological Centres, nor one of its Tropical cyclone warning centers, as its main mission is to support the United States government agencies. JTWC monitors, analyzes, and forecasts tropical cyclone formation, development, and movement year round. Its area of responsibility covers 89% of the world's tropical cyclone activity. Staffing The center is manned by about 37 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. See also Invest (meteorology) Pacific hurricane season Pacific typhoon season North Indian Ocean cyclone season [[{{#ifexpr:>6|–|–}}