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Hurricane Ignacio threatened Hawaii during July 1985. A tropical depression formed on July 21 far from land. It became Tropical Storm Ignacio later that day. Ignacio then rapidly intensified and peaked with 130 mph (215 km/h) winds on July 24. Ignacio weakened quickly, though it briefly leveled off in intensity as a Category 2 hurricane. Ignacio was downgraded into a tropical storm on July 26 while passing south of Hawaii. Continuing to weaken, Ignacio dissipated on July 27. A hurricane watch was briefly issued for the Hawaiian Islands even though the watch was dropped when Ignacio weakened. However, Ignacio still brought high waves and light rainfall to the islands. A few roads were closed, but otherwise, damage was minimal. ==Meteorological history== Based on data from the ships ''UJGN'' and ''Okean'' and satellite imagery, the next tropical cyclone of 1985 was spotted early on July 21 while located southwest of San Diego. Situated over sea surface temperatures, the depression attained tropical storm intensity a few hours later.〔 Intensifying further west than normal,〔(【引用サイトリンク】title=The 1985 Central Pacific Tropical Cyclone Season )〕 the storm reached winds of 70 mph (140 km/h) roughly 24 hours after formation. Nine hours later, the Eastern Pacific Hurricane Center dropped advisories on Ignacio as it had left their area of responsibility and into the Central Pacific Hurricane Center's (CPHC) warning zone. A Hurricane Hunter aircraft investigated Ignacio at daybreak on July 22, and found that Ignacio had developed a well-defined eye and winds of 85 mph (165 km/h). Based on this, the CPHC upgraded Ignacio to hurricane status. Continuing to rapidly intensify, Hurricane Ignacio moved west-northwest at and was soon upgraded into Category 2 status on the Saffir-Simpson Hurricane Scale (SSHS). Several hours later, the hurricane attained major hurricane status, Category 3 or higher on the SSHS. Later that day, a Hurricane Hunter aircraft discovered that Hurricane Ignacio had reached its peak wind speed of 130 mph (210 km/h) and a central pressure of , making Ignacio one of the most intense hurricane to traverse the Central Pacific.〔 The hurricane held peak intensity for several hours, however, an upper trough northwest of the Hawaiian Islands was gradually approaching Ignacio. Subsequently, the environment was rapidly becoming less conductive as the trough induced increased southwesterly wind shear and introduced colder and drier air into Ignacio's circulation. By 1800 UTC July 24, Ignacio was no longer a major hurricane as satellite imagery suggested that the eye had become irregular and soon disappeared. Air Force aircraft confirmed the weakening trend despite being located in an area where other hurricanes such as Hurricane Dot in 1959 and Hurricane Fico in 1978 maintained their intensity around the same time of the year. Minor re-intensification may have occurred the next day as the eye re-developed,〔 however, this theory is not supported in the hurricane database. The hurricane resumed its westerly course, and Hurricane Ignacio was downgraded a Category 1 hurricane at 1800 UTC on July 25, and a tropical storm the next day. While passing south of Hawaii, Ignacio dropped to tropical depression status early on July 27, and dissipated shortly after that.〔 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「Hurricane Ignacio (1985)」の詳細全文を読む スポンサード リンク
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