A CONCENTRATED OUTBREAK OF TORNADOES, DOWNBURSTS AND MICROBURSTS, AND IMPLICATIONS REGARDING VORTEX CLASSIFICATION
A CONCENTRATED OUTBREAK OF TORNADOES, DOWNBURSTS AND MICROBURSTS, AND IMPLICATIONS REGARDING VORTEX CLASSIFICATION
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DOI：
10.1175/1520-0493(1983)111
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发表时间：
1983-01-01
影响因子：
3.2
通讯作者：
WAKIMOTO, RM
中科院分区：
文献类型：
--
作者：
FORBES, GS;WAKIMOTO, RM
1977年8月6日，伊利诺斯州斯普林菲尔德附近发生了一次引人注目的恶劣天气。空中和地面调查显示，17个气旋性涡旋、1个反气旋性涡旋、10个下击暴流和19个微暴流出现在一个有限的（20公里× 40公里）区域内，并伴有弓形雷达回波。大约一半的涡旋出现在沿着阵风锋。其他一些似乎已经发生在一个中气旋伴随着弓回波的流通，但这些涡似乎已经专门发展在响应本地化的边界层涡度生成与周边的微暴流水平和垂直风切变。这些涡旋中的一些，以及文献中其他破坏性的涡旋，并不符合气象学术语表中定义的龙卷风。一个更务实的定义龙卷风的建议。
A remarkable case of severe weather occurred near Springfield, Illinois on 6 August 1977. Aerial and ground surveys revealed that 17 cyclonic vortices, an anticyclonic vortex, 10 downbursts and 19 microbursts occurred in a limited (20 km× 40 km) area, associated with a bow-shaped radar echo. About half of the vortices appeared to have occurred along a gust front. Some of the others appear to have occurred within the circulation of a mesocyclone accompanying the bow echo, but these vortices seem to have developed specifically in response to localized boundary-layer vorticity generation associated with horizontal and vertical wind shears on the periphery of microbursts. Some of these vortices, and other destructive vortices in the literature, do not qualify as tornadoes as defined in the Glossary of Meteorology. A more pragmatic definition of a tornado is suggested.