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2009 Kentuckiana Flash Flood
On August 4 at 9:25 am EST a major thunderstorm producing large hail and winds in excess of advanced at the leading edge of a cold front moving across the American Midwest, causing a flash flood that struck Louisville and portions of the surrounding Kentuckiana region. The National Weather Service estimated that between three and six inches of rain fell(14–24 cm) across the city in less than one hour, breaking all previous one-hour rainfall records in the area. Most of the downtown area was underwater, with the deluge reaching deep in places. The flood was the third major disaster to strike the region in less than one year.
Early damage estimates were in the hundreds of millions of dollars. The University of Louisville and the Louisville Public Library's main branch each sustained millions of dollars in damage. On August 12, Governor of Kentucky Steve Beshear requested the federal government declare all of Jefferson County, Kentucky a major disaster area.
==Storm==
A slow moving cluster of thunderstorms descended from central Indiana into south-central Indiana and north-central Kentucky. As it entered the region at the head of a cold front, the storm strengthened significantly and began producing hail, strong winds, and heavy rain. As the storm moved into the Louisville Metropolitan Area, it continued to strengthen as a torrential downpour inundated the area. Within a one-hour period more than six inches (17 cm) of rain fell on parts of the region, breaking all previous rainfall records for a one-hour period. By the end of the day, more rain fell than is normal for the entire month of August. Downtown Louisville, New Albany, Jeffersonville, and Clarksville were particularly hard hit with water depth surpassing four feet in some areas. Creeks and streams quickly flooded many neighborhoods, and flash floods rendered numerous streets and areas impassable. Severe lightning and wind that accompanied the storm led to more widespread damage.〔Courier Journal, p. A-1〕
Rain continued throughout the day, letting up at around 1 pm EST. The ground had already been saturated from rains in the preceding days causing water levels to drop slower than normal. By 3 pm EST a light rain resumed, but most of the flood waters had receded in the higher elevations of the city. Deep pools of standing water remained in isolated areas of the city until August 5.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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