How long will monsoon depression linger in Guangxi? Experts say so.

Experts said that from August 3, 2023 to August 8, 2023, the monsoon depression lingered in Guangxi.

Affected by the low monsoon pressure in the Beibu Gulf, since the night of August 3, 2023, there have been heavy rains to heavy rains in some areas of the three coastal cities in Guangxi, with heavy rains in some areas, cloudy showers and partial heavy rains in other areas. It reached its strongest in the morning of August 7, 2023, mainly wandering in the south of Guangxi for a long time. After the evening of August 7, 2023, it will gradually move westward and then leave Guangxi, and its influence on Guangxi will end on the evening of August 8, 2023.

The meteorological department of Guangxi specially reminded that southern Guangxi and western Guangxi should pay attention to preventing heavy rainfall and its secondary disasters such as landslides and urban and rural waterlogging; The meteorological risk level of mountain torrents in Chongzuo and Fangchenggang municipal bureaus is high, so it is necessary to strengthen defense. South Guangxi and coastal areas should pay attention to prevent the adverse effects of heavy rainfall on agricultural summer "double robbing" and aquaculture.

Brief introduction of monsoon depression

Monsoon depression is a low-pressure system that occurs in areas affected by summer monsoon, and it is a low-pressure system formed in a large area of intertropical convergence zone. It is rich in water vapor, which is generally influenced by subtropical high or continental high. The system is large and small, and the structure is dense and loose, while the cloud system is mainly distributed in the south or center of its body. If the monsoon depression goes deep inland, when the steering flow is weak, its moving speed will be slow, which often leads to continuous heavy precipitation.

The horizontal scale of mature monsoon depression is about 500 kilometers. The closed cyclone circulation is the strongest on the isobaric surface at 700 HPA, and the anticyclone circulation above 400 HPA is the strongest. The low pressure axis inclines slightly to the west with height. In the center of monsoon depression, the lower layer is cold and the middle and upper layers are warm, and the temperature amplitude can reach 3C. The west side of the low pressure has the largest upward movement, and the humidity and precipitation on the west side are also the largest. The average daily precipitation is 100-200mm.