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