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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Late-May 1957 tornado outbreak ： ウィキペディア英語版 Late-May 1957 tornado outbreak The late-May 1957 tornado outbreak occurred from eastern New Mexico to Oklahoma, western Arkansas, southern Kansas, eastern Colorado, and southeastern Wyoming on May 24–25, 1957. 37 tornadoes touched down over the area, most of which took place across northern and western Texas, in addition to southern Oklahoma. The strongest tornado was rated at F4 status south of Lawton. Unusually, some tornadoes touched down during the early morning hours, whereas most Plains tornadic systems are nocturnal. Four deaths were attributed to the tornadic activity. The tornado outbreak was related to the arrival of a strong shortwave trough. ==Meteorological synopsis== An upper-level trough moved over the central United States. Subsequently, a tornado outbreak took place over portions of Kansas, Nebraska, Missouri, and Oklahoma on May 20. Cold upper air temperatures and marginal low level moisture produced severe weather across the southern and central Great Plains. On May 21, this shortwave trough and a deep surface low produced an additional violent (F4)〔 tornado in Minnesota, while tornadoes killed 15 people in Missouri. On May 22, another area of low pressure was centered over southwest Oklahoma in attendance with a front, which extended from central New Mexico to Missouri. A weakening Pacific cold front dissipated near Del Rio. In Texas, low-level moisture, originating from the Gulf of Mexico, remained abundant during the four days that preceded the May 24 outbreak.〔 Eventually, lifted index values increased to -10, which correlated with surface-based CAPE values near 3,500 j/kg. On May 23, dewpoints rose across western Texas, and temperatures reached 77°F in the warm sector. On May 24, high moisture levels surged into southeastern New Mexico on both sides of a warm front. A new surface low pressure area also developed over New Mexico.〔〔 Later, fog developed northward to Amarillo, in tandem with exceptionally high dew points. The tornadoes that occurred formed along and just north of the warm front.〔 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「Late-May 1957 tornado outbreak」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.