Public Storm Warning System (PSWS) PAGASA's Once a tropical cyclone enters the PAR, regardless of strength, it is given a local name for identification purposes by the media, government, and the general public. PAGASA categorises typhoons into five types according to wind speed. The fewest per year were 4 during the years 1955, 1958, 1992, and 1997. In 1993, a record 19 typhoons made landfall in the country making it the most in one year. Those that made landfall or crossed the Philippines, the average was nine per year. From the statistics gathered by PAGASA from 1948 to 2004, around an average of 28 storms and/or typhoons per year enter the PAR (Philippine Area of Responsibility) – the designated area assigned to PAGASA to monitor during weather disturbances. Bagyo is the Filipino term for any tropical cyclone in the Philippine Islands. Climate change exacerbates the situation with typhoons in the Philippines. The Philippines sit across the typhoon belt, making dangerous storms from July through October. Main article: Typhoons in the Philippines PAGASA's Tropical Cyclone Intensity Scale Category The wettest known tropical cyclone to impact the archipelago was the July 1911 cyclone, when the total precipitation for Baguio was distributed over the four days as: 14th – 879.8 mm (34.6 in), 15th – 733.6 mm (28.9 in), 16th – 424.9 mm (16.7 in), 17th – 200.4 mm (7.9 in) followed by extraordinary drought from October 1911 to May 1912, so that the annual amount of those two years were hardly noticeable. Monsoon rains, although hard and drenching, are not normally associated with high winds and waves.Īt least 30 percent of the annual rainfall in the northern Philippines can be traced to tropical cyclones, while the southern islands receiving less than 10 percent of their annual rainfall from tropical cyclones. Annual average rainfall ranges from as much as 5,000 millimeters (197 in) in the mountainous east coast section of the country, to less than 1,000 millimeters (39 in) in some of the sheltered valleys. The summer monsoon brings heavy rains to most of the archipelago from May to October. Winter monsoons or northeast monsoons ( Filipino: Amihan), by contrast, have a dominant easterly component and a strong tendency to diverge, subside and cause drought. The intensity and duration, however, are not uniform from year to year. Most summer monsoons or southwest monsoons ( Filipino: Habagat) have a dominant westerly component and a strong tendency to ascend and produce copious amounts of rain (because of the condensation of water vapor in the rising air). Monsoons are large-scale sea breezes which occur when the temperature on land is significantly warmer or cooler than the temperature of the ocean.
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