The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Filipino: Pangasiwaang Pilipino sa Palingkurang Atmosperiko, Heopisikal at Astronomiko, abbreviated as PAGASA) is a Philippine national institution dedicated to provide flood and typhoon warnings, public weather forecasts and advisories, meteorological, astronomical, climatological, and other specialized information and services primarily for the protection of life and property and in support of economic, productivity and sustainable development.
PAGASA monitors tropical cyclone activity and issues warnings within its area of responsibility. This area is bound by an imaginary line drawn along the following coordinates:
Tropical cyclone bulletins are issued by PAGASA every six hours for all tropical cyclones within this area that have or are anticipated to make landfall within the Philippines, or twelve hours when cyclones are not affecting land. On August 27, 2007, Pagasa announced that it was putting up a tornado warning system, days after several more powerful and destructive tornadoes damaged houses in Central Luzon. It also advised residents in Western Luzon to expect more tornadoes (July to September) due to the abnormal weather patterns, the monsoon and climate change. On August 23, 2007, a 2nd tornado destroyed 30 houses in 4 villages in San Miguel, Bulacan, the first having damaged 27 houses in San Rafael on Aug. 8.