How is the middle and lower reaches of the Yangtze River affected by rainfall?

Since July, the main rain belt in the south has been maintained from the eastern part of southwest China to the middle and lower reaches of the Yangtze River. In the past week, heavy rain caused extreme rainfall in many places; In the next two days, the rain belt will rise northward in stages until 13 falls southward again, overlapping with the previous rainfall. So what is the situation that the middle and lower reaches of the Yangtze River are affected by rainfall?

On July 9, heavy rain or rainstorm occurred in southern Sichuan, southwestern Chongqing, northwestern and southeastern Guizhou, central Hunan, central Jiangxi, northern Zhejiang, western Fujian and northeastern Guangxi. Heavy rains in Ji 'an, Jiangxi, Fuzhou, Fujian and Nanping reached 250-375 mm, of which the maximum point rainfall in Ji 'an was 48 1 mm, and the maximum hourly rainfall in the above areas was 50-93 mm.

Several days of heavy rain have caused daily rainfall in many places to exceed historical extremes. According to statistics, the daily rainfall of Hunan, Hubei, Jiangsu, Shanghai, Jiangxi, Anhui, Zhejiang and other places ***3 1 National Meteorological Observatory exceeded the maximum in July, Xishui in Hubei, Huangmei, Longhui in Hunan, Jiujiang County, Guixi, yingtan, Xinjian, Xingan, Xiajiang, Jishui, Yongxin, Taihe and Longhui in Jiangxi. ?

The rainfall in provincial capital cities changes obviously. For example, there was heavy rain in Nanchang, Jiangxi Province for two consecutive days from 7 to 8, and there was also heavy rain during the day on 10. However, with the northward movement of the heavy rainfall belt, the precipitation will be significantly reduced in the next 3-5 days. From 4th to 7th, there was a very heavy precipitation in Wu Hanyou, which weakened and stopped in these two days, but it will strengthen again after the rain belt moved northward at night 10. ?

According to the precipitation forecast, there will be heavy precipitation in the middle and lower reaches of the Yangtze River in the next 7- 10 days, and the precipitation will last for a long time, mainly concentrated in the Yangtze River basin, including the downstream Taihu Lake basin. On June 5438+0 1- 12, there will be process precipitation in the Huaihe River Basin, with the area rainfall of 60- 120mm and the local rainfall of 160mm, which also needs special precautions. In addition, in the next three days, there will also be strong rainfall in the eastern part of the northwest and the eastern part of the southwest, so it is necessary to guard against possible secondary disasters in these areas.

The public should be alert to geological disasters such as mountain torrents and waterlogging in urban and rural areas that may be caused by heavy rainfall, and pay attention to the possible adverse effects of strong convective weather.