Why is it cold and snowy in Xining this winter?

The reasons why Xining is dry and cold this winter are as follows:

Meteorology, snowfall needs at least the cooperation of water vapor and cold air. During the period from February 65438+ in 2022 to October 65438+ in 2023/kloc-0, the cold air from the polar regions split frequently, and there was also strong cooling and blowing weather in Qinghai. The necessary water vapor for snowfall comes from the south, and the southwest monsoon is weak in winter, so it is difficult to transport it from the south to the north. Therefore, there is less precipitation and dryness in Xining this winter. Judging from the previous climate, in June, the temperature in Xining was about 1 degree Celsius higher than that in the same period of last year, with less precipitation and continuous dry weather.

From May 9th, the daily minimum temperature in Xining gradually rose to single digits. Although the temperature is getting warmer, the air is dry. The reporter learned from the Xining Meteorological Observatory that since the flood season this year, the weather in Xining has been mainly dry, cold and windy, and there has been no effective precipitation in Xining for 19 days.

Formation of rain and snow

The formation of snow is the direct change of gas into solid, that is, sublimation. When there are countless tiny dust and particles floating in the air, the air at high altitude gradually becomes thin, showing a saturated state in which water vapor cannot invade. At this time, some water vapor enters small dust and other particles to form ice crystals.

Its main formation condition is that the atmosphere is below 0 degrees. Once the ice crystals at the top of the clouds melt, they will absorb the supersaturated water vapor around them and grow, forming a snow waterfall.