永嘉2019·4·24强对流天气过程分析

Analysis of Strong Convective Weather Process in Yongjia 2019·4·24

利用常规观测资料、Micaps资料、温州双线偏振多普勒雷达产品、洪家站探空数据等资料,分析2019年4月24日下午永嘉出现的强雷暴天气过程,结果表明:此次强对流天气过程是在高空槽东移过程中,弱冷空气影响配合低层切变线和低空急流的大背景下产生;上干下湿的结构积聚了大量不稳定能量,弱冷空气的侵入使得不稳定能量得到释放;24日下午先后有2次强对流云团影响永嘉,特别是后一次过程影响剧烈,然后两者叠加影响程度加重,产生短时强降水、雷雨大风等强对流天气。

This article used conventional observation data,Micaps data,Wenzhou dual-linear polarization Doppler radar products,Hongjia Station airsonde data and other data to analyze the severe thunderstorm weather processed that occurred in Yongjia on the afternoon of April 24,2019.The results showed that :The strong convective weather process was produced during the eastward movement of the upper-altitude trough,under the influence of the low-level shear line and the low-level jet stream.The upper dry and lower wet structure accumulated a large amount of unstable energy,weak cold air.The invasion caused the release of unstable energy;on the afternoon of the 24th,there were two strong convective cloud clusters that affected Yongjia,especially the latter process.The impact of the latter process was severe,and the superimposed impact of the two increased,resulting in short-term heavy rainfall,thunderstorms and strong convections weather.