Analysis of Rain and Snow Weather Process in the Middle and East of China from December 28 to 30, 2020

The China National Climate Center and Centers for Environmental Prediction data were used in this work. Using the knowledge of synoptic principles analysis, rain snow weather process middle east from December 28 to 30, 2020 was analyzed. results show that: 1) This a large-scale precipitation process. Affected by cold wave, temperature drops sharply, many places dropped below extreme value, accompanied strong winds. 2) is mainly caused eastward movement upper-level trough leading air southward intersect with warm wet air, shear thread lower layer cooperates. 3) ocean Novaya Zemlya. 4) From evolution trend 500 hPa geopotential height field ground pressure field, surge belongs type transverse vertical.