Recently, there have been heavy rains in many places in China. Why are there often strong winds and thunderstorms?

Since the beginning of summer, it has been raining continuously in the south, and the flood disaster is serious. According to news reports, this year is also the first time in ten years that a rainstorm warning has been issued continuously for 3 1 day. ?

In June, plum blossoms in Jiangnan, the middle and lower reaches of the Yangtze River, Jianghuai and other places were earlier than normal, and there were five large-scale rainfall weather processes in the southern region. The rainstorm covered a wide range and had a large intensity. The rainfall in some areas of Jiangsu, Anhui and Hubei was more than 1 times than normal. ?

Only the northern region. There are some anomalies in the atmospheric circulation this year. The meridional degree of the circulation in the middle and high latitudes in Asia is relatively large, and cold vortices are often cut off in the Hetao of China or the northwest of Mongolia. Cold vortex is one of the main weather systems that cause strong convection, because it is easy to cause atmospheric instability and large vertical wind shear. Although there is always cold vortex in spring and summer, it is more than normal this year, so when the cold vortex deepens and moves to the southeast, strong convective weather often occurs in North China (including Shandong).

In addition to the long rainy season, the increase of rainfall this summer, especially the increase of extreme rainfall, is also closely related to climate change.

Chen Yu, director of the National Meteorological Administration, said that Jiangnan, the middle and lower reaches of the Yangtze River and Jianghuai entered Mei earlier than normal by 7 days, 5 days and 1 1 day respectively. What is even more worrying is that this year's rainy season is not only earlier than usual, but also more extreme than usual. According to the statistics of China Meteorological Bureau, the national average precipitation in June reached 1 10.9mm, which was more than normal 12%. Such extreme and record-breaking heavy precipitation has undoubtedly aggravated the seriousness of flood control this year.

The subtropical high affecting China is mainly the western Pacific subtropical high belt. ? Wang Yongguang, chief forecaster of the National Climate Center, said that since June this year, the subtropical high in the western Pacific has been continuously strong, the abnormal anticyclone wind field prevails in the lower troposphere of the northwest Pacific, and the water vapor transport from the South China Sea and the western Pacific on the west side of the subtropical high is obviously strong, providing abundant water vapor conditions for continuous precipitation in the southern region.

From the perspective of urban construction and management, it is imperative to strengthen the management of urban rain and flood. By building a sponge city and a smart city, the city's ability to cope with climate change, extreme rainfall and maintain ecological functions will be improved, and at the same time, accurate and timely urban waterlogging information and disaster prevention and avoidance schemes will be provided for urban residents.

As ordinary residents, if faced with the danger of floods, they need to immediately check the weather, early warning and other notification information, and actively do a good job in disaster prevention and avoidance; If you are temporarily in a safe area, in addition to raising awareness of risk prevention, you can also reduce energy consumption as a low-carbon trip, reduce the use of plastic products, and do your best to curb climate warming and extreme weather.