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The 2013 Colorado floods was a natural disaster occurring in the U.S. state of Colorado. Starting on September 9, 2013, a slow-moving cold front stalled over Colorado, clashing with warm humid monsoonal air from the south. This resulted in heavy rain and catastrophic flooding along Colorado's Front Range from Colorado Springs north to Fort Collins. The situation intensified on September 11 and 12. Boulder County was worst hit, with recorded September 12 and up to of rain recorded by September 15, which is comparable to Boulder County's average annual precipitation (20.7 inches, 525 mm).〔(Average Yearly Precipitation for Colorado ). Current Results. Retrieved September 19, 2013.〕 The National Weather Service's Hydrometeorological Design Studies Center stated in a document that the annual exceedance probability (AEP) for the entire rainfall event was as low as 1/1000 (0.1%) in places. 〔http://www.nws.noaa.gov/oh/hdsc/aep_storm_analysis/8_Colorado_2013.pdf〕 The flood waters spread across a range of almost from north to south, affecting 17 counties. Governor John Hickenlooper declared a disaster emergency on September 12, 2013, in 14 counties: Adams, Arapahoe, Broomfield, Boulder, Denver, El Paso, Fremont, Jefferson, Larimer, Logan, Morgan, Pueblo, Washington and Weld. By September 15, federal emergency declarations covered those 14 counties as well as Clear Creek County. On October 15, 2013, the State of Colorado launched a website to assist flood survivors and victims with resources and information at coloradounited.com. ==Background== The state of Colorado had been experiencing varying levels of drought prior to the week of storms starting on September 9. The U.S. Drought Monitor stated that "The combination of ample Gulf and Pacific tropical moisture (in part from Tropical Storms Manuel (Pacific) and Ingrid (Gulf) which inundated Mexico), stalled frontal systems, and upsloping conditions produced the widespread rainfall (Colorado's Front Range )."〔http://droughtmonitor.unl.edu/ September 17, 2013〕 This resulted in rainfall totals exceeding 20 inches in parts of Boulder County, along with numerous flash floods, property destruction and loss of life. 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「2013 Colorado floods」の詳細全文を読む スポンサード リンク
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