2019年7月衡阳一次致灾暴雨过程分析

Analysis of a Disaster-Causing Rainstorm Process in Hengyang in July 2019

利用Micaps实况资料、FNL再分析资料、国家卫星中心FY2G云顶亮温等资料对2019年7月7~9日衡阳地区强降水过程进行了分析,得出:1) 此次过程是由高空槽、低涡及副热带高压位置稳定少动,带动东北气流与副高边缘西南气流在长江中下游地区交汇,在中低层有利的动力抬升条件配合下造成的持续性强降雨过程。2) 此次过程分为3个阶段,分别在7~9日对衡阳地区造成暴雨及大暴雨。3) 此次过程水汽、热力、动力条件都十分有利,且与强降水发生的时段、落区对应较好。

Based on Micaps data, FNL reanalysis data, FY2G cloud top brightness temperature data of National Satellite center and other data, the process of heavy precipitation in Hengyang during July 7~9, 2019 was analyzed. The results show that: 1) This process was a continuous heavy rainfall process caused by the stable position of the upper trough, low vortex and subtropical high, which drove the northeast air flow and the southwest air flow at the edge of the subtropical high to converge in the middle and lower reaches of the Yangtze River, and the favorable dynamic lifting conditions in the middle and lower levels were coordinated. 2) The process is divided into 3 stages, respectively in the 7~9 Hengyang area caused by heavy rain and heavy rain. 3) The water vapor, thermal and dynamic conditions of this process are very favorable, and they correspond well with the time period and falling area of heavy precipitation.