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Tropical Depression Ten was a short-lived tropical cyclone that made landfall on the Florida Panhandle in September 2007. The system developed as a subtropical depression on September 21 in the northeastern Gulf of Mexico from the interaction of a tropical wave, the tail end of a cold front, and an upper-level low. Initially containing a poorly defined circulation and intermittent thunderstorm activity, the system transitioned into a tropical depression after convection increased over the center. Tracking northwestward, the depression moved ashore near Fort Walton Beach early on September 22 and dissipated over southeastern Alabama shortly thereafter. Initially the depression was forecast to move ashore as a minimal tropical storm, and the threat of the depression prompted state of emergency declarations in Mississippi and Louisiana. It was the first tropical cyclone to threaten the New Orleans area since Hurricane Katrina and the destructive 2005 hurricane season. Overall impact from the cyclone was minor and largely limited to light rainfall. However, the precursor system spawned a damaging tornado in Eustis, Florida, where 20 houses were destroyed and 30 more were damaged. == Meteorological history == Tropical Depression Ten formed from the complex interaction between an upper-level low, a tropical wave that produced Tropical Storm Ingrid, and the tail end of a cold front. By September 17, the system produced widespread thunderstorm activity over The Bahamas and western Atlantic Ocean. The upper-level low over the Florida Panhandle increased convection across the area, and on September 18 the system began crossing Florida. Initially very disorganized, surface pressures gradually decreased across the region, with a weak low-pressure area developing on September 19. A reconnaissance aircraft flight into the system on September 20 reported a well-defined low and strong wind gusts in squalls as the system tracked into the northeastern Gulf of Mexico, along with limited and disorganized thunderstorm activity. Convection gradually became better organized, with a well-defined band in its eastern semicircle and intermittent thunderstorm activity near the center. Despite an overall disorganized structure, with a poorly defined circulation and an upper-level low aloft, the National Hurricane Center initiated advisories on Subtropical Depression Ten at 1500 UTC on September 21 while it was located about 40 miles (60 km) south of St. Vincent Island, Florida, citing "the potential for additional development right along the coastline." In post-analysis, it was classified a subtropical cyclone three hours earlier.〔 With a mid-level ridge to its northwest, the subtropical depression was anticipated to parallel the coastline of the Gulf Coast of the United States. As a result, it was forecast to attain winds of 45 mph (75 km/h) and move ashore along southern Mississippi.〔 The circulation became better defined as convection modestly increased over the center, and within six hours of its development the system transitioned into a tropical depression. The cyclone continued tracking northwestward, making landfall around 0000 UTC on September 22 near Fort Walton Beach, Florida, with winds of 35 mph (55 km/h). The cloud pattern deteriorated as it tracked inland, and 3 hours after it moved ashore the National Hurricane Center issued its last advisory on the depression. As the depression tracked into Alabama, it became increasingly disorganized,〔 and the system dissipated as a tropical cyclone early on September 22.〔 Its remnant surface low continued west-northwest before dissipating near the Louisiana/Texas border early on September 23. 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「Tropical Depression Ten (2007)」の詳細全文を読む スポンサード リンク
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