湖南省永州市2006年4月10日龙卷分析

An Analysis of a Tornado in Yongzhou,Hunan Province

利用灾后调查资料、常规天气图及永州多普勒雷达资料,分析2006年4月10日凌晨发生在湖南省双牌县理家坪乡出现的严重风灾。结果表明:这是永州市自有气象记载以来首次确认的龙卷灾害;该龙卷为超级单体龙卷,具有非常经典的钩状回波特征;强的水平风垂直切变和热力不稳定环境促使了超级单体中的中气旋的产生,中低层的辐合最终在中气旋中形成龙卷。

The severe wind which took place in the morning of April 10, 2006 in Lijiaping town, Shuangpai County, Hunan Province was analyzed based on the post-disaster inspection data, conventional weather data and Yongzhou Doppler radar data, It shows that the severn wind was the first confirmed tornado in Yongzhou City in normal meteorological records, It was a superceU tornado, and had classical tornado book characteristics in the radar base reflectMty. The strong vertical wind shear and therrrdynamic instability resulted in a meso-cyclone in the supercell, The convergence of on low and middle-level atmosphere in the mesocyclone resulted in the tornado finally,