Why is the weather in Guizhou bad?

In recent days, affected by the cold wave, a large area of freezing in Guizhou has caused disasters. A few days ago, the Yachi River accident and the damage to Zunyi power have begun to threaten the production and life of Guizhou people, which can not help but remind people of the catastrophic freezing disaster in 2008. But why does Guizhou often suffer from freezing disasters? Let's take a look together.

The formation of freezing rain in Guizhou is a very coincidental weather situation, and the requirements for weather are quite wonderful. When freezing rain forms, the temperature of the air layer near the ground is lower than 0℃, but the temperature of the air layer above it is higher than 0℃, otherwise it will form snow and Guizhou will become snowy. This atmospheric structure keeps the supercooled water droplets in the upper clouds in liquid state all the time. If the temperature is very low, snow will form instead of freezing rain. When they fall downward, enter the near-surface air layer and land on objects with a temperature below 0℃, they immediately freeze into smooth and transparent ice, which is called rime in meteorology. In short, it is the inverted formation mode of snow.

The freezing rain weather in Guizhou is closely related to its special geographical location, topography and altitude. Guizhou is located in the middle and low latitudes, and the cold air mass from the north can directly affect Guizhou, and the water vapor from the southern ocean is rich. In addition, Guizhou is located in the slope of the northeast of Yunnan-Guizhou Plateau. This tall Xuefeng Mountain stands in the west, with an average elevation of about 1 100 meters. The terrain is high in the west and low in the east, so the terrain rises and forms freezing rain under the action of cold air.

In winter, the northern cold air mass that frequently goes south is blocked by the large terrain of Yunnan-Guizhou Plateau, and the famous Yunnan-Guizhou static front (also known as Yunnan-Guizhou quasi-static front and southwest static front) is formed in the southwest. In winter, the quasi-static front in Yunnan-Guizhou area is not easy to disappear and control Guizhou for a long time. In addition, the warm and humid air flow from the Bay of Bengal constantly supplemented the abundant water vapor transport, forming the freezing rain in Guizhou.

Freezing rain in Guizhou basically occurs every year, but it rarely snows. Growing up, I seldom saw snow in Guiyang, but I was often upset by freezing rain. When I was a child, the water pipes were frozen by freezing rain, so it was a problem to use water in winter. The freezing rain in 2008 was the worst in Guizhou history. At that time, freezing rain appeared in Yunnan, Hunan, Jiangxi, Anhui, Zhejiang and other places.

The range of freezing rain in Guizhou this year is also very large. From a perennial point of view, the most frequent freezing rain area is the northwest of Guizhou, such as Weining Station. Freezing rain is very harmful, affecting power equipment, transportation equipment and crop production. It is necessary to prepare for the winter and know some emergency measures. Thank you. I hope it's good for you.