The main reasons why Guizhou Province is frequently affected by southwest vortex are as follows.

The main reasons why Guizhou Province is frequently affected by southwest vortex are as follows:

The main reason why Guizhou Province is frequently affected by southwest vortex is its geographical location and geomorphological characteristics. Guizhou is in the trigger position of southwest vortex, and also the intersection position of southwest warm and humid airflow and cold air, which is rich in water vapor and energy. When the southwest vortex occurs, it is easy to produce a strong updraft and cause a lot of precipitation. The main reason why Guizhou Province is frequently affected by southwest vortex is that Guizhou is in the trigger position of southwest vortex, and it is also the intersection position of southwest warm and humid airflow and cold air.

The reason why Guizhou is affected by the southwest vortex is mainly because it is in the trigger position of the southwest vortex and the intersection position of the southwest warm and humid airflow and cold air, and it is rich in water vapor and energy. Therefore, when the southwest vortex appears, it is easy to produce a strong updraft, resulting in a lot of precipitation. In addition, the geographical location and geomorphological features of Guizhou have also increased the convection power, which is conducive to the production of a large amount of precipitation.

Causes of cold vortex formation

1, the formation of cold vortex is mostly due to the deepening of the high-altitude westerly trough, and finally the southern part of the trough is cut off by warm air. Cold vortex is the abbreviation of cold vortex, which mainly refers to the cold closed low-pressure circulation system in the middle and upper troposphere in the middle and high latitudes, and the temperature near it is obviously lower than the surrounding temperature. This cold vortex that separates the cold air mass from the mother body is to cut off the low pressure.

2. Cold vortex is the abbreviation of cold vortex. It is pointed out that the center of the cold vortex in the sky (generally above 700 hectopascals) is colder than the surrounding vortex, and its intensity increases with the increase of height. North China cold vortex and Northeast cold vortex in spring and summer. The vortex weather system located at high altitude has a lower central air pressure than its surroundings. Vortex whose center temperature is lower than the ambient temperature is called cold vortex.

Take the southwest vortex as an example. It is a kind of low vortex weather system which has the greatest influence on the weather in China. It originated in the southwest of China, hence its name. It is formed by the dynamic and thermal influence of the Qinghai-Tibet Plateau. It often appears one or two kilometers near the surface. Usually it first appears on the 500 HPA isobaric weather map of plateau, 700 HPA isobaric weather map of western Sichuan and Yunnan, and 850 HPA isobaric weather map near Sichuan Basin. The southwest vortex is cold and warm.