河南省焦作市一次大到暴雨天气过程分析

Analysis of a heavy rainstorm in Jiaozuo City,Henan Province

利用常规天气图资料、物理量场和多普勒雷达资料等,从天气形势、物理机制、雷达回波特征等方面入手,对2012年7月9日大到暴雨天气进行分析。结果表明:强降雨是在副热带高压加强北上与西风槽共同作用的大背景下产生的,中低层切变线的北抬、低空西南急流所造成的水汽输送和辐合、高低空急流耦合是形成此次大到暴雨天气的重要原因。

using conventional weather map data,physical field and Doppler radar data,the occurrence and development of heavy rain on July 9,2012 was analyzed from the aspects of weather situation,physical mechanism and radar echo characteristics.The results show that:the heavy rainfall is generated under the background of subtropical high strengthening the interaction of northward and westerly trough.The northward uplift of the shear line in the middle and low level,the moisture transport and convergence caused by the low-level southwest jet,and the coupling of high-level and low-level jet are the important reasons for the heavy rain.