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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Meteorological history of Hurricane Dennis ： ウィキペディア英語版 Meteorological history of Hurricane Dennis The meteorological history of Hurricane Dennis spanned twenty-two days, beginning with its inception as a tropical wave over Africa on June 26, 2005, and terminating with its dissipation on July 18 over the Great Lakes of North America. The incipient wave that became Dennis emerged over the Atlantic Ocean on June 29 and moved briskly to the west. Dry air initially inhibited development, though once this abated the wave was able to consolidate into a tropical depression on July 4. The depression soon crossed Grenada before entering the Caribbean Sea whereupon increasingly favorable environmental factors, such as low wind shear and high sea surface temperatures, fueled intensification. Turning west-northwest, the system achieved tropical storm status on July 5 and hurricane status the following day. Formation of a well-defined eye and central dense overcast signaled Dennis's intensification into a major hurricane. The powerful storm soon struck Granma Province, Cuba, as a Category 4 early on July 8; violent winds battered the province and caused extensive damage. Paralleling the western coast of Cuba, Dennis attained its peak winds of 150 mph (240 km/h) later that day before making a second landfall in the country, this time in Matanzas Province. Interaction with the mountains of Cuba caused significant weakening; however, once Dennis emerged over the Gulf of Mexico on July 9, it was able to quickly reorganize. The hurricane reached Category 4 strength for a third time on July 10 as it approached Florida, weakening somewhat before striking the state. Dramatic weakening ensued once the cyclone moved ashore. Dennis lingered as a tropical depression and remnant low for roughly a week, traversing the Mississippi River Valley and Ohio River Valley before finally dissipating over Ontario on July 18. ==Origins== On June 26, 2005, the National Hurricane Center (NHC) began monitoring a tropical wave well-inland over Africa. The feature was tracked via radiosonde observations from various nations for two days before being analyzed as a surface feature on June 28 over western Senegal.convection—shower and thunderstorm activity—the westward moving system featured some cyclonic flow;〔 it emerged over the Atlantic Ocean early on June 29. Conflicting observations from Dakar, Senegal, made tracking the wave difficult, with surface observations revealing a clear shift in wind direction and upper-level soundings showing no change. Regardless of the exact position of the system, accompanying convection soon diminished and the system became ill-defined. By June 30, the system grew significantly and multiple low-level circulations developed within the broader cyclonic envelope. Weather models at the time depicted a low probability of tropical cyclogenesis in the subsequent days. Gradual development ensued over the following days,〔 though the broad circulation initially remained largely devoid of convection due to dry air associated with the Saharan Air Layer. Two distinct low-level centers became apparent on July 2 as the overall system progressed west.〔 Surface observations from the Windward Islands and Guyana depicted a broad circulation; however, satellite animations failed to show a defined center, inhibiting its classification as a tropical cyclone. The westernmost of the two centers moved across the Windward Islands early on July 4 and lost organization soon thereafter.〔 Banding features developed with the eastern circulation throughout the day, consolidating around a 1012 mbar (hPa; 29.89 inHg) low. Later on July 4, upper-level outflow—an anticyclonic feature that provides thermal ventilation for tropical cyclones and allows for further development—became increasingly prominent.〔 With continued organization, the NHC classified the system as Tropical Depression Four at 18:00 UTC at which time it was situated east of St. George's, Grenada.〔 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「Meteorological history of Hurricane Dennis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.