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The 1964 Pacific typhoon season has no official bounds; it ran year-round in 1964, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean. The scope of this article is limited to the Pacific Ocean, north of the equator and west of the International Date Line. Storms that form east of the date line and north of the equator are called hurricanes; see 1964 Pacific hurricane season. Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions in this basin have the "W" suffix added to their number. Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric, Geophysical and Astronomical Services Administration or PAGASA. This can often result in the same storm having two names. The 1964 Pacific typhoon season was the most active season in recorded history with 39 storms. Notable storms include Typhoon Louise, which killed 400 people in the Philippines, Typhoons Sally and Opal, which had some of the highest winds of any cyclone ever recorded at 195 mph, Typhoons Flossie and Betty, which both struck the city of Shanghai, China, and Typhoon Ruby, which hit Hong Kong as a powerful 140 mph Category 4 storm, killing over 700 and becoming Hong Kong's worst named typhoon in history. ==Seasonal activity== 52 numbered tropical waves formed this year in the Western Pacific, of which 39 became tropical storms. 26 storms reached typhoon intensity, of which 7 reached super typhoon strength. The season's 39 tropical storms is the most recorded tropical storms to form in the basin.〔(NOAA/NGDC - Earth Observation Group - Defense Meteorological Satellite Program, Boulder )〕 The South China Sea saw higher than normal activity in 1964 – between the years 1959-1963, the average was 3.2 typhoons to travel the area, compared to the 10 typhoons in the 1964 season. Two of the super typhoons, Sally and Opal, set seasonal records - Sally was strongest storm of the season, reaching a pressure of 894 mbar while Opal was the largest system of the season. Five typhoons performed cyclonic loops this season; only two or three happen on average yearly. Kathy did a rare move by executing a second minor loop while undergoing the first loop. Another unusual phenomenon that occurred during the 1964 season was rapid degeneration of typhoons. Notable ones include Alice, Elsie and Cora which degenerated into tropical lows within hours. No apparent reason has been found to this rapid degeneration event.〔(1964 Summary of Tropical Cyclones (JTWC) )〕 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「1964 Pacific typhoon season」の詳細全文を読む スポンサード リンク
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