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2015 Texas–Oklahoma flood and tornado outbreak
Preceded by more than a week of heavy rain, a slow-moving storm system dropped tremendous precipitation across much of Texas and Oklahoma during the nights of May 24–26, 2015, triggering record-breaking floods. Additionally, many areas reported tornado activity and lightning.〔(【引用サイトリンク】title=REPORTS: Damaging Storms Slam Texas With Major Flooding, Tornadoes )〕 Particularly hard hit were areas along the Blanco River in Hays County, Texas, where entire blocks of homes were leveled. On the morning of May 26, the National Weather Service issued a flash flood emergency for southwest Harris County (which includes the city of Houston) and northeast Fort Bend County. The system also produced deadly tornadoes in parts of Mexico and Texas.〔(【引用サイトリンク】url=http://www.usnews.com/news/us/articles/2015/05/26/the-latest-recovery-cleanup-set-to-begin-in-texas-mexico )〕
==Meteorological synopsis==
According to Bob Henson from Wunderground, inflow of low-level moisture from the Gulf of Mexico and the combination of very slow moving large-scale storm systems set the stage for the floods. He added, ''Upper-level winds were largely aligned with the low-level frontal zone, an ideal setup for “training echoes” (successive downpours over the same area). In addition, rains were concentrated by several mesoscale convective vortices, small-scale centers of low-pressure that developed along the frontal bands, in some cases resembling mini-tropical cyclones.''〔(【引用サイトリンク】author=Wunderground )〕 The stationary trough during May is linked to both the El Nino and amplified midlatitude short-wave train. 〔http://onlinelibrary.wiley.com/doi/10.1002/2015GL065211/full〕
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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