Meteorological Bureau: The number of rainstorm days in extreme precipitation events in the Yangtze River is less than 98 years

● The cause of the abnormal climate is mainly caused by the El Niño event

● The number of weather stations with extreme precipitation events, the number of stations with daily precipitation exceeding historical extremes, and the number of stations with days with rainstorm exceeding 8 days are all significantly lower than those in 1998.

After entering this year, weather and climate were abnormal in China, and extreme weather and climate events frequently occurred. The China Meteorological Administration recently pointed out that since the flood season (May 1 to July 20), the average rainfall in the Yangtze River Valley (521.1 mm) was 14.7% more than in the same period of the previous year, slightly more than in the same period of 1998 (518.7 mm); However, the number of weather stations that experienced extreme precipitation events this year, the number of stations with daily precipitation exceeding historical extremes, and stations with more than 8 days of rainstorm days were all significantly lower than in 1998. The intensity of plum rain in the middle and lower reaches of the Yangtze River was also significantly weaker than in 1998.

According to the China Meteorological Administration, the characteristics of rain and disasters since the flood season were mainly manifested in the following aspects: Heavy rainfall processes are frequent and rainfall is heavy. Since the entrance into the Sui Dynasty, there have been 14 heavy rainfall events in the south of China. The process accumulated a large amount of rainfall, and rainfall was 800-1000 mm in areas such as central and eastern Jiangxi, southwestern Zhejiang, northwestern Fujian, and central Guangdong, and over 1000 mm in some areas.

Strong rainfall areas and concentrated rainfall periods. Heavy rainfall since the flood season took place mainly in Jiangnan, South China and other places, and the average rainfall in the main rainfall areas reached 825.4 mm, which was the highest in the same period in history. From July 8th to July 15th, the Yangtze River valley experienced a heavy rainfall since the beginning of this year, and there were 6 stations in the basin that exceeded the historical extremes of daily rainfall.

Meteorological and secondary disasters are severely affected. Since the flood season, frequent heavy rains in the southern region have caused over-alert levels in some rivers in the Yangtze River basin and the Huaihe River valley, and the flooding has increased; severe storms and floods have occurred in Jiangsu, Zhejiang, and Anhui provinces (regions, cities); Hubei, Hunan, and Guizhou provinces ( In some areas of the district and city, serious secondary disasters such as mountain torrents, landslides and mudslides have occurred.

The China Meteorological Administration believes that the reason for this unusual climate change since the beginning of this year was mainly due to the El Niño event; as the El Niño event ended in late spring and the Western Pacific subtropical high moved north, the rain belt lifted north to the north of the Yangtze River, south The floods weakened; at the same time, the convection in the western Pacific was gradually strengthened, and typhoon activity in July increased significantly.

According to an expert analysis of the China Meteorological Administration, the characteristics of the rain since the entrance to the site were similar to those in 1998, but they were not the same. This year, the number of rainstorm days in the middle reaches of the Yangtze River and the rated daily precipitation exceeding 100 millimeters are larger than in 1998. However, judging from the current national situation, the number of meteorological stations with extreme precipitation events, daily precipitation exceeding historical extreme stations, and heavy rain The number of stations with days above 8 days was significantly less than in 1998. The distribution of stations with continuous extreme precipitation is very similar to that of 1998, and both are concentrated in Jiangnan and South China. Compared with 1998, plum blossoms in the middle and lower reaches of the Yangtze River are obviously late, Meimei is early, Meiyu concentration period is short, Meiyu rainfall is significantly less, and Meiyu intensity is obviously weaker than in 1998.

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