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The 1940–1948 Pacific hurricane seasons all began during late spring in the northeast Pacific Ocean and the central Pacific. They ended in late fall. Before the satellite age started in the 1960s, data on east Pacific hurricanes is extremely unreliable. In a few years, there are no reported cyclones although many systems certainly formed. ==1940 season== Late on June 17, west-northwest of Acapulco and close to the coast of Mexico, an area of thunderstorms formed into a tropical cyclone. The system was very small, and eventually became a hurricane. It headed west-northwest or northwest, and was last detected early on June 18. A ship in the eye measured a pressure of . On July 20, a tropical depression was observed southwest of Acapulco. Historical Weather Maps show this depression near 17N 102W. It intensified into a tropical storm on July 21, tracked northwest, and dissipated on July 24. A depression/remnant low was tracked until July 26. The low was last seen near 24N 129W on the 27th. The lowest pressure reported by a ship was . On July 29, a tropical cyclone was noticed. It traveled west-northwest or northwest, and dissipated sometime after July 30. A ship reported a pressure of .〔 South of Acapulco, a tropical cyclone was spotted on August 3. Historical Weather Maps (HWM) show a low on August 2 near 11N 109W It rapidly tracked to the west-northwest, and was last seen on August 5. The low is carried on HMW until August 9 near 17N 135W. It is possible that this system retained Tropical Storm force winds until approximately August 7 A ship reported a pressure of . On September 4, a tropical cyclone was reported. It moved westward, and was lost track of on or after September 5. The lowest reported pressure was . A tropical cyclone was detected on September 22. The next day, it had intensified into a hurricane. By September 24, the hurricane was close to the Revillagigedo Islands. After that, no further observations were reported. A ship reported a pressure of in association with this hurricane.〔 A tropical cyclone existed well out to sea from October 6 to 11. It traveled northwesterly, and had a lowest recorded pressure of . Around October 21, a former typhoon that had previously impacted Wake Island crossed into the central north Pacific. It headed eastwards north of Midway Island. It gradually wheeled around to the southwest. It dissipated just east of Midway around October 22.〔 Another tropical cyclone existed from October 26 to 28 off the coast of Central America. A ship recorded a pressure reading of .〔 A tropical cyclone well southwest of Manzanillo was tracked from November 1 to 3. Due to a blocking area of high pressure, it took an unusual southwesterly track. Its lowest recorded pressure was . 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「1940–48 Pacific hurricane seasons」の詳細全文を読む スポンサード リンク
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