一次早春冷锋风雹天气过程分析

Analysis of A Hailstorm Process in Early Spring

利用高空图、地面图、探空图等常规资料,多普勒雷达和风廓线雷达探测资料对2016年4月3日影响江西的强风雹天气过程进行了分析,结论如下:冷暖空气交汇、切变线趋于明显、强西南急流、中低层干舌、地面冷空气是此次强风雹天气发生的有利环流背景。同时气团极不稳定,不稳定能量强、水汽条件充沛、垂直风切变高,为强对流天气的发生、发展提供了不稳定、水汽与动力条件。多普勒雷达上强度50 d Bz以上快速东移的"弓形"飑线、中层径向辐合为大风的预报提供了依据。风廓线雷达上强对流天气发生前后有辐合系统过境,地面大风前有强西南急流下沉,3~4 km高空西南偏西急流迅速增强。

By using upper and surface observation data and Doppler and VWP data,analysis of a hailstorm process in early spring of 2016 have been conducted and conclusions were as following.Cold air and warm air intersection,obvious shear line,strong southwest jet stream,dry tongue in the middle upper air and cold front in the surface provide favorable circulation background.And extremely strong instability,abundant water vapor as well as strong vertical wind shear were favorable for the storm.The fast moving bow shaped squall line with a high radar echo of 50 dBz and MARC provide the basis of strong wind forecast.VWP radar shows convergence system,strong southwest jet sinking and increasing LLJ at 3~4 km altitude before and after the squall line.