What are the climatic characteristics in the flood season that deserve attention?

Flood season refers to the period when the river water level rises regularly due to seasonal precipitation, melting ice and snow. The flood season in China mainly refers to the concentrated period of heavy precipitation caused by the East Asian summer monsoon advancing from south to north, and the concentrated heavy precipitation in some areas may cause floods in some basins during the flood season.

During the flood season, atmospheric convection is active, heavy precipitation is concentrated, and typhoons frequently strike, which often leads to disasters such as storms and floods, and also easily leads to secondary disasters such as mountain torrents and mudslides. On the contrary, if there is little precipitation and high temperature in a certain area, it will also lead to drought. In addition, in the context of climate change, extreme weather and climate events such as heavy precipitation and high temperature heat waves are also increasing. Therefore, the flood season is a critical period for meteorological disaster prevention and reduction.

Different regions in China face different meteorological disasters in different periods. In the first flood season in South China, drought and flood in South China and southern Jiangnan and low temperature in spring sowing are the most noteworthy. During the rainy season, droughts and floods in Jianghuai, the middle and lower reaches of the Yangtze River and the northern part of the south of the Yangtze River are the most touching. During the active period of typhoon, typhoon rain and waterlogging along the southeast coast and south China coast are the key points of defense. In addition, midsummer, drought and flood in North China and low temperature in Northeast China easily affect industrial and agricultural production.

Throughout the flood season, the key points of preventing meteorological disasters in different regions are not the same. Southeast coast and south China coast should be highly alert to the influence of typhoon; Northwest and southwest regions should guard against geological disasters caused by heavy precipitation; Attention should be paid to preventing high-temperature heat waves in southwest, east, south and south China; Major grain producing areas and major river basins should pay attention to the effects of drought, rainstorm and flood.