铜仁市一次雷暴大风过程分析

Analysis of a Thunderstorm Gale Process in Tongren City

利用常规站资料、ERA5资料(0.25°×0.25°)、务川雷达和铜仁新一代多普勒天气雷达资料对2022年4月24日发生在贵州铜仁市多个区(县)的一次雷暴大风过程进行分析。结果表明:(1)此次天气过程发生在上干下湿的不稳定环境中,高空槽、南支槽、低涡、切变线和地面辐合线都为此次强对流天气过程提供了触发条件。(2)大的DCAPE值、中层中等强度的垂直风切变和低层较强的垂直风切变以及较大的850 hPa与500 hPa的温差都是利于大风产生的条件。(3)大风常常出现在弓形回波前部突出处,高悬的强回波、弱回波区、高的回波顶高以及径向速度中出现逆风区和强并且深厚的中层径向辐合等都是出现大风天气的雷达产品特征。

Base on station data,ERA5 data(0.25°×0.25°),Wuchuan radar and Tongren new-generation Doppler weather radar data,the process of a thunderstorm gale occurred in Tongren City,Guizhou Province on April 24,2022 was analyzed.The results show that:(1)the weather process is dry wet unstable environment,high trough,south trough,vortex,shear line and ground convergence conditions for the strong convective weather process.(2)Large DCAPE value,moderate strength vertical wind shear in the middle layer,strong vertical wind shear in the lower layer,and a large temperature difference between 850 hPa and 500 hPa are all conditions conducive to strong wind generation.(3)Strong wind often appears at the protrusion of the front part of the bow echo.The high hanging strong echo,weak echo area,high echo top high and strong headwind zone and deep middle level radial convergence in the radial velocity are all the characteristics of radar products in windy weather.