202 1 what's the reason for so much rain?

As the "pushing hand" behind the weather in flood season in China, the intensity and position of subtropical high determine the distribution and change of rain belts in central and eastern China. Dragon boat water in South China, plum rain season in South China, and seven downs in North China always transport the prepared water vapor to a specific place within a general time range every year, as if it were raining at a fixed point by navigation.

The most important reason why the rainfall in flood season is so violent, lasting and full of stamina is the good water vapor conditions. For example, the recent Meiyu in Jiangnan and Jianghuai areas is the continuous rainfall (frontal rain) brought by sufficient water vapor. There are two typical "water vapor channels" that lead to severe and continuous heavy precipitation in flood season in China, and the Pacific Ocean and the Indian Ocean are powerful "suppliers".

Introduction:

China is a country with monsoon climate, and winter is mainly controlled by the north wind. For example, Siberian cold air frequently "cools" China under the encouragement of the north wind; In summer, the wind direction changes greatly, from north wind to south wind, which transports water vapor from the ocean to the land. Therefore, with the help of the "east wind" of the summer monsoon, the Pacific Ocean and the Indian Ocean can continuously transport the important "raw materials" needed for precipitation to China.