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1978 Bossier City tornado outbreak
The 1978 Bossier City tornado outbreak was an outbreak of 11 tornadoes that occurred during the early morning hours of December 3, 1978, in Louisiana and Arkansas. The outbreak produced several significant (F2–F5) tornadoes, several of which were long tracked. The first and most destructive of the tornadoes was a violent F4 tornado touched down on the eastern bank of the Red River in Bossier City, Louisiana, at approximately 1:50 a.m. CST. The tornado produced a path up to wide and nearly long through the heart of Bossier City. The only two deaths to occur in Bossier City were two young girls who were killed when a car was thrown through their bedroom wall. The Bossier City tornado became the fifth tornado in American history to produce at least $100 million (non-adjusted) in damage.〔Grazulis, ''The Tornado'', 206.〕
==Meteorological synopsis==
On Monday, November 27, 1978, a cold front moved through Northwest Louisiana. By Friday, December 1, a positively tilted trough was present in the upper atmosphere from the High Plains to the Desert Southwest. This allowed Gulf moisture to return to the lower part of the atmosphere Friday night. The placement of the upper atmospheric trough allowed very little movement of the associated front from Thursday to Saturday. At this time, the front stretched over north Texas, Southern Missouri, Southwestern Arkansas, and Southeast Oklahoma. This front was unusually strong for the month of December, and placed the Shreveport area under the right exit region of a strong jet stream. The strong synoptic-scale lifting was favorable to thunderstorm formation. Also at this time, a low pressure system had developed over Northeast Texas. This caused increased low-level wind shear that enabled the development of thunderstorms. Meanwhile, a warm temperature plume, or inversion, at the 850-millibar geopotential height allowed low-level instability to increase. CAPE thus soared to 2,179 j/kg on December 2, the evening before the outbreak began.
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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