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| April 27–29, 1912 tornado outbreak ： ウィキペディア英語版 |
April 27–29, 1912 tornado outbreak
The April 27–28, 1912 tornado outbreak was a major tornado outbreak. At least six violent tornadoes touched down throughout Oklahoma, with near constant activity until early the next day. At least 15 cities were affected. 40 people died, and 120 injured.
==Meteorological synopsis==
Limited weather data was collected and recorded at that time in Oklahoma. Predating upper atmospheric measurements, most data collection was of human observations, along with temperature, pressure, wind speed and direction, and rainfall.〔
A cold front moved south through Oklahoma into Texas on April 26, before stalling in central Texas, leaving a southwest/northeast stationary front. Early on the 28th, it pushed back northward against a warm front to the east. The warm front was noted to have moved from the southeast on the 27th to the northeast on the 28th; it was this movement of warm air against the cold front over that that fueled the storms that provided the tornado activity.〔
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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