一次罕见局地暴雨天气过程的诊断分析

Diagnosis analysis of a rare autumn rainstorm weather process in Bozhou

利用常规高空资料分析了博州地区一次局地大暴雨的大尺度环流背景,并利用FY卫星云图、TBB资料和区域气象自动站资料分析了局地暴雨发生的时段和落区,同时对物理量场的演变特征进行了分析。结果表明:强降水是在有利的天气背景条件下,由对流层中低层弱冷空气入侵触发的一次中小尺度天气过程;低层辐散、高层辐合为强降水的形成提供强的动力条件;博州的特殊地形条件和地面东风也是造成局地暴雨的一个重要原因。

using the conventional sounding data analysis of a regional rainstorm in Bole Region of the large scale circulation background,and the use of FY,TBB satellite image data and regional automatic weather station data analysis of rainstorm occurrence period and drop zone,while the physical quantity field evolution characteristics in the analysis of.The results show that:the strong precipitation is in favorable weather conditions,by the middle and low troposphere weak cold air intrusion triggered a small scale weather process;low level divergence,high convergence for strong precipitation formation provides strong power condition;in the special terrain and ground east wind is caused by a rainstorm main reason.