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April 2, 2006 Tornado Outbreak : ウィキペディア英語版
April 2, 2006 tornado outbreak

The April 2, 2006 tornado outbreak was a series of tornadoes that occurred during the late afternoon and evening of April 2, 2006, in the central United States. It was the second major outbreak of 2006, in the same area that suffered considerable destruction in a previous outbreak on March 11 and March 12, as well as an outbreak on November 15, 2005. The most notable tornadoes of the outbreak struck northeastern Arkansas, the Missouri Bootheel, and West Tennessee, where several communitiesincluding Marmaduke, Arkansas, Caruthersville, Missouri, and Newbern, Tennessee suffered devastating damage. In total, 66 tornadoes touched down across seven states, which is the most in a single day in 2006. In addition, there were over 850 total severe weather reports, including many reports of straight-line winds exceeding hurricane force and hail as large as softballs, which caused significant additional damage in a nine-state region.
The outbreak was a deadly one; there were a total of 28 tornado-related deaths plus two other deaths from straight-line winds.〔() 〕 It was the deadliest tornado outbreak in the United States since the May 2003 tornado outbreak sequence in the first week of May 2003, which killed 48 people. Twenty-six of those deaths were caused by a single supercell thunderstorm which produced damaging and long lived tornadoes from north central Arkansas into northwest Tennessee.
==Meteorological synopsis==
The outbreak took place as a result of a cold front that tracked across the central United States, triggered by a deep low pressure area in the Upper Midwest. The warm humid air mass ahead of the cold front, along with high upper-level wind shear, allowed for the production of supercells across the region.
The outbreak was expected to have started the previous day in the High Plains as the cold front tracked across that region. The supercells did not fire up as expected and only one small tornado was reported on April 1, in Pawnee County, Kansas. Severe weather that day was largely restricted to significant microbursts and large hail.
A moderate risk of severe weather was issued by the Storm Prediction Center (SPC) for April 2, with the main risk being tornadoes and large hail.〔 The primary risk area was the central Mississippi Valley and lower Ohio Valley up to central Illinois, which is where most of the tornadoes touched down. Many tornado watches – although no PDS watches – would be issued across the region. While a significant severe weather event was expected, the extreme nature caught many forecasters by surprise, based on the risk levels and probabilities estimated by the SPC in the main area affected.〔()〕
Farther north, the initial thunderstorm development in eastern Missouri quickly developed into a squall line, eventually becoming a derecho that produced many embedded – and generally weak – tornadoes and widespread wind damage across Illinois, Indiana, Kentucky and Ohio. Springfield, Illinois, struck by two tornadoes less than a month earlier, was hit again by tornadoes and damaging straight-line winds of up to , as was the St. Louis, Missouri area. The storm quickly tracked through Indiana, Ohio and Kentucky with a peak wind gust of in Lexington, Kentucky. Wind damage was reported in and around Cincinnati, Ohio, Louisville, Kentucky and Indianapolis, Indiana among other cities.〔
The line of storms would slowly weaken as it traveled eastward, and the severe weather came to an end late that evening.

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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