Why is Jiangxi prone to rainstorm, flood or river bank breach?

There are many weather systems that affect the circulation situation of rainstorm weather in Jiangxi. The most important thing is that there is a warm and deep system on the isobaric surface at an altitude of 500 hectopascals, called subtropical high. Its formation and movement are in line with the southwest airflow formed by the Indian low pressure, and it is the water vapor transport source of the rainstorm in Jiangxi.

In addition to the atmospheric circulation weather system, the cause and degree of flood disaster are also related to other factors, among which the type of rainstorm, terrain influence and flood encounter are more significant.

The special topography of Jiangxi province has obvious influence on the distribution of rainstorm areas. Jiangxi is surrounded by mountains on three sides and water on one side, and it is open to the north, which opens the door for cold air from the north to the south to enter the province. Most of the rainstorm centers are located in north-central Jiangxi.

Extended data:

Floods in Jiangxi province are all caused by heavy rain. Every summer, the rainstorm is concentrated from April to June, and the maximum rainstorm at a single station is generally between 150 ~ 300mm.

The rainstorm observed since the founding of the People's Republic of China, except for the one-day rainstorm at Lushan Station, is about 900 mm, and the maximum rainfall in 24 hours is 50 1 mm (at Dongxiang Station, from 9: 00 on August 1953 to 9: 00 on August 18), which is the highest on the third day.