China Meteorological News reporter Yan Wei
Expert Consultant: Chen Yu, Chief Climate Service Officer of National Climate Center.
Since June 2,Rainstorm warninglinkContinue to punch in for 32 days.Since June, three heavy rains have covered 60% of counties (cities) in southern China, with wide rainfall range, heavy rainfall and strong extremes. The rainfall in many places has broken historical records, with an average rainfall of 112.7 mm, which is 13.5% more than normal, and the ninth highest since 1961.
Rainfall in many places broke the historical record and entered Mei early.
In June 2020, the national average rainfall was 112.7 mm, which was 13.5% higher than the normal period (99.3 mm), the ninth highest since 1961 (the first highest in 1998).
In June 2020, the rainfall in many places was more than that in the same period of history and all the year round. The precipitation in north-central northeast, southeast northwest, Jianghuai, Jianghan, northern Jiangnan, eastern southwest, northeastern Guangxi and central Tibet is generally 50% to 1 times higher than normal, and it is 1-2 times higher in eastern Heilongjiang, most of Jiangsu, most of Anhui, central Hubei and northern Hunan. The precipitation in Hubei is the highest in the same period of history, and Jiangsu and Heilongjiang are the second highest in the same period of history, and Anhui is the third highest. ?
The south of the Yangtze River, the middle and lower reaches of the Yangtze River and the Jianghuai region in China entered the Meiyu period on June 1, 9 and 10 respectively, 7 days, 5 days and 11 days earlier than normal.
Three heavy rains covered 60% of counties (cities) in the south.
Since June, there have been three rainstorm processes in South China: from June 2 to 10, from June 12 to 25 and from June 27), with a wide coverage, long duration and heavy rainfall. Nearly 60% of counties (cities) in South China have experienced rainstorm. Although the rain belt swings greatly from north to south, there is a high degree of overlap between heavy rainfall areas. Heavy rains occur frequently in central Guangdong, eastern Guangxi, central Jiangxi, central Zhejiang and southern Anhui, and the accumulated rainfall is large. ?
Since June, the number of rainstorm days in most parts of southern China has been more than normal, and some areas in Anhui, Jiangxi, Jiangsu, Guangxi and Guizhou have been more than 3 to 5 days. The extreme of heavy precipitation is prominent.
The Central Meteorological Observatory issued a rainstorm warning for 32 days.
Since June 2, the rainstorm warning has been punched for 32 days.
Should the subtropical high "back the pot"?
Since June this year, the western Pacific subtropical high (subtropical high) has been continuously strong, and the abnormal anticyclone wind field prevails in the lower troposphere of the northwest Pacific. The water vapor transport from the South China Sea and the western Pacific is obviously strong on the west side of the subtropical high, which provides abundant water vapor conditions for continuous precipitation in the southern region. In early June, the ridge line of the subtropical high was located in the north, and the water vapor convergence in South China and Jiangnan was strong, resulting in extreme precipitation in South China and Jiangnan in early June. After mid-June, the subtropical high obviously moved northward, and the position of the ridge line swung from north to south (the position of the ridge line is the key factor affecting the position of the rain belt). From the northern part of the south of the Yangtze River to Huanghuai area, the southwest wind prevailed and the water vapor transport was strong. At the same time, the cold air in the north frequently goes south, which makes the cold and warm air masses meet in the northern part of Jiangnan to Huanghuai area, forming persistent heavy precipitation, which is obviously more.
(Editor: Su Yujun)
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