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The 2009 Pacific typhoon season was the period that tropical cyclones formed in the Western Pacific Ocean. The season ran throughout the year during 2009, with most tropical cyclones forming between May and November. The scope of this article is limited to the Pacific Ocean, north of the equator between 100°E and the International Date Line. Tropical storms that form in the entire Western Pacific basin are assigned a name by the Japan Meteorological Agency. Tropical depressions that form in this basin are given a number with a "W" suffix by the United States' Joint Typhoon Warning Center. In addition, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assigns names to tropical cyclones (including tropical depressions) that enter or form in the Philippine area of responsibility. These names, however, are not in common use outside of the Philippines. During the season, 39 tropical depressions developed within the Western Pacific, whilst two formed outside the region before moving into the Western Pacific. ==Seasonal forecasts== During each season, several national meteorological services and scientific agencies forecast how many tropical cyclones, tropical storms, and typhoons will form during a season and/or how many tropical cyclones will affect a particular country.〔 These agencies include the Tropical Storm Risk (TSR) Consortium of the University College London, Guy Carpenter Asia-Pacific Climate Impact Centre of the City University of Hong Kong (GCACIC) and Taiwan's Central Weather Bureau.〔〔 On January 4, PAGASA reported that they were expecting 19 or less tropical cyclones to affect the Philippines during 2009. During March, the TSR Consortium released their first forecast of the season and predicted that activity within the basin would be about 20% below normal with 25.6 tropical storms, 16 typhoons and 6.7 intense typhoons and an ACE index of around 247.〔 Later that month the Hong Kong Observatory, predicted that the typhoon season in Hong Kong would be near normal with five to six tropical cyclones passing within of the territory compared to an average of 6. During April, the GCACIC issued its first seasonal forecast for the year and predicted that the season would see activity near its average with 31 tropical cyclones, 27 tropical storms, and 18 typhoons occurring during the season. The GCACIC also predicted that 4 tropical cyclones would make landfall on Southern China between April and August compared to an average of 3, they also predicted that no tropical cyclones would make landfall between August and December.〔 On May 7, TSR increased its forecast to 27.5 tropical storms, 17.6 typhoons, 9.1 "intense" typhoons and an ACE index of about 311 units, after La Nina conditions weakened and confidence grew that La Nina conditions would not return during 2009.〔 Later that month the Vietnamese National Center for Hydro Meteorological forecasts predicted that six or more tropical cyclones would affect Vietnam during 2009. During June, the GCACIC reported that the total number of tropical cyclones had decreased from 31 to 30, and that the total number of typhoons had increased to 19, while there was no change to the number of tropical storms predicted to occur during the season. They also predicted that 3 tropical cyclones would make landfall on Southern China between July and December compared to an average of 4.〔 On June 30, the Taiwan Central Weather Bureau predicted that the season would see activity near its average of 26.6, and predicted that between 24 - 27 tropical storms would occur over the Western Pacific.〔 The Central Weather Bureau also predicted that of the 24-27 tropical storms forecast 3-5 of them would affect Taiwan.〔 In their July and August forecasts TSR upped their prediction for the amount of intense typhoons by one to ten and eleven respectively, whilst predicting the same amount of tropical storms and typhoons.〔〔 In July and August they also predicted that the season would now see activity about 20% above normal.〔〔 After their initial prediction was surpassed by Tropical Depression Tino forming, PAGASA announced that they expecting two or three more cyclones to affect the Philippines, before the end of the year. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「2009 Pacific typhoon season」の詳細全文を読む スポンサード リンク
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