Freezing rain refers to liquid precipitation immediately after freezing and dropping. In southern China, especially in Southwest China, freezing rain is a normal weather phenomenon in winter.
The normal weather will last for a long time, which will result in meteorological disasters. The snow and ice rain weather in southern China lasted for more than 20 days in January 10, 2008, and it formed the most serious meteorological disaster in 50 years. Affected by the winter wind, the cold air in the north is accumulated in the vast area of the east of the Hengduan Mountains. In the clouds, Guizhou, Sichuan and Guangxi, including the ground and low altitude in Western Hunan, the cold air atmosphere called "cold cushion" is formed in meteorology. Every winter, the region is also affected by the warm wet air from the bay of Bengal, which is covered by the cold pads across the Hengduan Mountains, forming a warm layer of about 1.5 kilometers to about 3 kilometers. In winter, when the cold northern air continues to go south, it forms a much more colder layer.
When cold air meets the heating current, the favorable conditions for rainfall and snow are produced. The clearer the contrast between the cold and warm, the more intense the rainfall. The two cold sandwiches and a warm "sandwich" layer are ideal beds for freezing rain: the warm layer in the middle provides sufficient water vapor, which is transported to the high level cold air atmosphere, rapidly condenses into supercooled water (below zero water droplets) or snowflakes, and over cold water passes through the bainilon process (a mechanism of precipitation formation in the clouds. If there are fewer ice crystals in the cloud, as long as there are more droplets to supply water, the ice crystals can grow to the degree of precipitation and become big snowflakes. The large snowflakes fall into the warm layer and melt into water drops, and the water drops continue to decline through the cooling pad to form the overcooled water droplets or the ice beads in the inner surface of the ice, which will quickly freeze down on the surface of the ground and form a freezing rain.
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