Major heavy rainfall events in China from April to October in 2022

Utilizing daily precipitation data from over 2400 stations across mainland China (from 20:00 to 20:00) and conventional weather chart data, the average precipitation from 1991 to 2020 was taken as the climatology. A statistical analysis of the main heavy rain weather processes in China from April to October 2022 was conducted, outlining the main influencing systems, occurrence periods, extent, and accumulated precipitation of each major rainstorm process. From April to October 2022, China experienced a total of 188 heavy rain days and 30 major heavy rain events. Among these, there were 9 occurrences in August, 6 in June, 5 in July, 4 in September, 3 in April, 2 in May, and 1 in October. Out of the 30 major heavy rain events, 5 were caused by the landing or influence of tropical cyclones. Among them, the heavy rain from July 1st to 7th due to Typhoon "Xenbia" was the most widespread and longest-lasting significant rainstorm event, with 421.6 mm of precipitation recorded in Sanya, Hainan, on July 2nd, marking the highest daily precipitation in the country for that year. The maximum accumulated rainfall for a single event in the year reached 688.4 mm, occurring in Shaoguan, Guangdong (from June 17th to 21st), and was caused by the combined effects of a low vortex, shear line, and low-level jet.