江汉平原中北部一次区域性暴雨的成因分析

An Analysis on Causes of a Torrential Rain in the Middle and North of Jianghan Plain

利用常规气象资料和NCEP再分析客观物理量场、卫星云图、多普勒雷达回波产品资料,对2007年7月13日发生在江汉平原中北部的暴雨过程进行了诊断分析。结果表明,(1)高空低槽东移是影响此次强降水过程的主要大尺度环流背景;(2)低层低涡暖切变和低空急流是暴雨的直接影响系统;(3)有利的热力水汽条件和动力条件是强降水产生和维持的机制;(4)卫星云图上"人"字型、"V"字型云系和多普勒速度资料上的"逆风区"、风切变可作为判断强降水落区落点的依据。

Based on the conventional observations, satellite cloud images and Doppler radar data, a heavy precipitation process in the north of Jianghan Plain on 13 July 2007 is analyzed. The result shows that： （1） the low trough of upper air are the main large-scale circulation systems impacting this event; （2） the vortex and warm shear line of low-layer is the major systems; （3） the heat and water vapor conditions, and dynamic conditions are mechanism of the torrential rain; （4） cloud systems, upwind areas and shears can be used to judge the rainstorm areas.