Analysis of Rainstorm Process over Henan Province of China in July 2021

Zhiyuan Chen, Wei Wang
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Abstract

Based on the data from the China National Meteorological Station and the fifth-generation reanalysis data of the European Center for Medium-Range Weather Forecasts, we investigated and examined the precipitation, circulation, and dynamic conditions of the rainstorm in Henan in July 2021. The results show that: 1) This precipitation is of very heavy rainfall level, beginning on the 19th and lasting until the 21st, with a 3-hour cumulative precipitation of more than 200 mm at Zhengzhou station at 19:00 on the 20th. The major focus of this precipitation is in Zhengzhou, Henan Province, and it also radiates to Jiaozuo, Xinxiang, Kaifeng, Xuchang, Pingdingshan, Luoyang, Luohe, and other places. 2) The Western Pacific Subtropical High (WPSH), typhoons “In-Fa” and “Cempaka”, as well as the less dynamic strengthening of the Eurasian trough ridge structure, all contributed to the short-term maintenance of the favorable large-scale circulation background and water vapor conditions for this rainstorm in Henan. 3) The vertical structure of low-level convergence and high-level dispersion near Zhengzhou, together with the topographic blocking and lifting impact, produced favorable dynamic lifting conditions for this rainstorm.
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2021年7月中国河南省暴雨过程分析
利用中国气象台资料和欧洲中期天气预报中心第五代再分析资料,对2021年7月河南暴雨的降水、环流和动力条件进行了调查和检验。结果表明:1)本次降水为强降水,从19日开始一直持续到21日,20日19时,郑州站3 h累计降水量超过200 mm;此次降水主要集中在河南郑州,同时也辐射到焦作、新乡、开封、许昌、平顶山、洛阳、漯河等地。2)西太平洋副热带高压(WPSH)、台风“in - fa”和“Cempaka”以及欧亚槽脊结构的弱动力强化,均为此次河南暴雨有利的大尺度环流背景和水汽条件的短期维持做出了贡献。为这次暴雨产生了有利的动力抬升条件。
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