Major heavy rain events in China from April to October in 2020

Abstract

Based on the daily precipitation data from over 2 400 weather stations and the conventional sounding data in mainland China, the major heavy rainfall events happened in China from April to October in 2020 were selected by comparing their precipitation with the average precipitation derived from 1981 to 2010. The precipitation distribution and the weather conditions for these events was summarized. Results indicated that during this period there were 188 heavy rain days and 41 major heavy rain events. The monthly average precipitation from May to September in 2020 was more than that in the same period of the last 12 years. There was a strong plum rain in the middle and lower reaches of the Yangtze River and the Jianghuai region from June to July, and the monthly cumulative precipitation was basically more than climatology by 50 percent, and more than twice in some areas. There were 28 heavy rainstorms occurred in China from April to October. Heavy precipitation occurred frequently in Sichuan province in August, causing secondary disasters such as waterlogging and landslides. The maximum daily precipitation of 423.2 mm occurred at Lushan station of Sichuan province on August 10. The maximum event total of 667.9 mm rainfall occurred at Longmen station in Guangdong province from 7th to 10th June in 2020.A total of 8 typhoons affected China, of which 5 typhoons landed in China. The typhoon was weak as a whole, but the Northeast region has been hit by three typhoons in a row from late August to early September.

Keywords

• heavy rain days
• heavy rain events
• synoptic system
• 2020