There are heavy rains all over the country. Why are these bad weather conditions concentrated?

First of all, July and August are rainy seasons, especially rainstorms and thunderstorms, which sometimes last for a long time. Frequent rainstorms are easy to cause floods and are particularly annoying.

A 24-hour precipitation of 50-99.9 mm is called a "rainstorm", a 100-249.9 mm is called a "heavy rainstorm", and more than 250 mm is generally called a "heavy rainstorm". The occurrence of heavy rain is very complicated. Generally speaking, it is caused by too much water vapor and the continuous rise of air flow, which leads to the instability of atmospheric structure. An obvious feature of rainstorm is that it is fast, also called rainstorm. It is menacing, accompanied by lightning, thunder and strong winds.

According to experts' analysis, the rainstorm is related to some abnormal manifestations of subtropical high. The cold air in the north moves south, and the subtropical high is stable and persistent, which leads to the occurrence of heavy rain, and the duration is relatively long and the rainfall is relatively large. At the same time, heavy rain is easy to cause flash floods, causing huge economic losses. On the west side of the subtropical high, in the area of Yunnan-Guizhou-Sichuan, there is also cold air constantly converging with the subtropical high and the southwest monsoon, resulting in continuous precipitation.

I think this bad weather is also related to the destruction of the environment. There are many natural disasters this year, with typhoons, earthquakes and flash floods. For example, Shanghai has announced many measures, such as garbage sorting, to increase environmental protection and improve resource utilization.

In a word, there are various reasons for the formation of bad weather, so we don't have to panic. We should pay attention to early warning information in advance to reduce economic and property losses.