吉安“4.16”致灾强对流天气过程的诊断分析

Diagnostic Analysis of Severe Convective Disaster Weather Process on April 16 in Ji'an

利用常规气象观测资料、雷达和地面中尺度加密站资料对2016年4月16日吉安出现的强对流天气过程进行了天气学诊断分析。结果表明:高空低槽、地面中小尺度系统、超低空急流是影响此次强对流天气发生的主导系统,对流层中层干侵入与低层暖湿空气结合使得大气层结不稳定度加强,地面存在明显的温度和湿度锋区、地面辐合线以及强的风垂直切变导致了此次强对流天气进一步发展与加强。

Based on the data acquired by conventional meteorological observation,radar,and mesoscale dense ground station,the severe convective weather process on April 16,2016 in Ji＇ an,has been diagnosed and analyzed. The results suggest that the upper air trough,the surface meso-and small-scale systems,and the very low level jet are the dominant causes that influence this severe convective weather. The combination of the dry incursion in mid tropospheric and the lower layer warm and wet air enhances the instability of atmospheric stratification. There are obvious temperature and humidity fronts above the ground,surface convergence line,and strong wind vertical shear,which lead to the further development and enhancement of the severe convective weather.