Why is the weather so strange this winter? In the past two weeks, there have been heavy rains and flash floods in Guangxi, just like spring.

The weather in Guangxi this year is really strange: i

Why is the weather so strange this winter? In the past two weeks, there have been heavy rains and flash floods in Guangxi, just like spring.

The weather in Guangxi this year is really strange: it seldom rains in spring; Late flood season before flood season 18 days; The number of typhoons that affected and landed in Guangxi in the late flood season was relatively small, but an extremely persistent rainstorm occurred in July. 165438+1October's heavy rainfall resembles a summer rainstorm, causing rivers in northern Guangxi to exceed the flood standard, waterlogging in cities, flooding of farmland and road collapse.

According to meteorologists, this climate anomaly in Guangxi is not isolated. The rain belt formed by the rainfall in Guangxi and the rainfall in Hunan and Zhejiang is caused by the abnormal background of atmospheric circulation. There are many reasons for the abnormal rainfall in June 5438+065438+ 10 in Guangxi: First, it is closely related to the location and intensity of the subtropical high. In June165438+1October, the intensity of the western Pacific subtropical high is strong and it is located at the western edge of the subtropical high. Guangxi is controlled by the east-southwest airflow on the edge of subtropical high, and at the same time it merges with the west wind over the Bay of Bengal, which leads to the strengthening of the southwest jet over Guangxi. Second, it is closely related to water vapor transport in tropical areas. The water vapor channel formed by the southwest jet continuously transports water vapor from the South China Sea to the land, and Guangxi is at the convergence center of this water vapor channel. The combination of the two causes continuous heavy precipitation in Guangxi.

According to the analysis of China Meteorological Bureau, this year is a strong year of El Ni? o, and the El Ni? o event and the warming of Indian Ocean SST are the fundamental reasons for the abnormal atmospheric circulation in tropical areas.