Traditional Culture Encyclopedia - Weather inquiry - The weather in Kunming is November.

The weather in Kunming is November.

The quasi-static front of Kunming is in the winter half year (11-April), and the Yunnan Plateau is generally occupied by dry and warm continental air masses, blowing warm southwest airflow. But in winter, under the guidance of the northwest wind, cold air from Siberia often travels south from Wan Li. However, it is difficult to reach the Yunnan Plateau. First, the average altitude here is about 2000 meters, which is in Wumeng Mountain and Yunnan in the northeast of Yunnan Province. The other is a long journey, and the cold air is already very weak, "people are exhausted." It is impossible to cross the Yunnan Plateau! What's more, the block from local heating can't be ignored! As a result, the cold air mass had to slow down and wander in front of the hillside, and finally demarcated with the "landlord" heating mass. The interface where cold and warm air masses intersect is called front in meteorology. The position of the front is naturally determined by the strength of both sides. The average geographical location is Zhanyi, Yunnan, west of Weining, Guizhou, south of Zhaotong, Yunnan and northeast of Kunming. The front is often northwest? Southeast, about 200 meters long? 400 kilometers. The cold air behind the front is heavier, sinking and wedging into the bottom of the warm air in the south. The warm air before the front is lighter and climbs above the cold air. As you can imagine, this front is inclined to the northeast from bottom to top, and the result of strong convection of cold and warm air near the front is: clouds make rain! So it appeared-there was little rain in Guiyang and other places after the front, and Kunming was sunny before the front! This front is not simple, its average duration is 4? 6 days, the longest time can reach 1 month. Because of it, the average annual sunshine hours between Kunming and Guiyang are 1 1 15.6 hours! The important weather system on the Yunnan-Guizhou Plateau in this winter half year is the quasi-static front of Kunming!

The so-called "quasi-static" means seemingly static, not static, but static. The quasi-static front of Kunming is not completely static, but it has the activity law of night (south) advance and day (north) retreat. Why? This is because there is no solar radiation at night, but the cooling of the earth's radiation helps to increase the strength of the cold air mass, so the cold air mass takes the opportunity to secretly retreat to the south. During the day, the solar radiation is strong, and the momentum of the heating mass overwhelms the opponent, which will inevitably recover the lost ground-push the "border" back to the north. Of course, if the cold air mass behind the front has a certain force, or if there is cold air in the north to supplement the "rescue", then the quasi-static front in Kunming will become stronger, and it will often move out of the average position and visit Kunming south, making Kunming rainy all night! Under normal circumstances, the weather brought by the quasi-stationary front in Kunming is not so fierce, but once the stationary front moving south meets the south branch trough full of water vapor, the good play begins: snowflakes fly in the middle and northeast of Yunnan behind the front, and it rains repeatedly in the south of Yunnan before the front! People can't forget two amazing snowfalls in Kunming, "1999.11"and "2000. 1.3 1". That vast expanse of heaven and earth, all white, is a winter gift from Kunming Zhunjingfeng!

The quasi-static front in Kunming is a frequent visitor in Yunnan for half a year in winter and a barometer of the weather in Kunming. As early as 1957, Ping Fan, a senior researcher of Yunnan Meteorological Bureau, devoted great enthusiasm to studying it, put forward the concept of "quasi-static stop in Kunming" for the first time, and summarized some of its activity rules, structural characteristics and forecast indicators. For decades, after unremitting research and exploration by meteorologists, people have a comprehensive understanding of the quasi-static front in Kunming. Especially in recent years, Duan Xu and others have conducted in-depth and detailed research on the three-dimensional airflow structure, genetic mechanism and weather of the quasi-static front in Kunming, which has made people more fully understand the quasi-static front in Kunming, and the forecast accuracy of the quasi-static front and its weather in Kunming has improved year by year!