This study uses data provided by the National
Meteorological Information Center of China, Japan Meteorological Agency (JMA)
and National Oceanic Atmospheric Administration
(NOAA) Physical Sciences Laboratory of the USA to analyze a cold air weather
process atthe beginning of January 2021. Synoptic analysis is mainly used to summarize synoptic laws
or patterns based on observational data, and describe and infer weather processes.
The main conclusions are as follows: The cold air travels south along the
northwest path, affecting most of China. During
the cold wave process, the first cold air is weak, which has a certain
cooling effect on northern China. The second cold air was guided by the low vortex, the accumulation in the transverse groove of Mongolia was strengthened, and the
cooling effect was significant. The southwest jet showed an increasing
trend, and the water vapor transport conditions were good. However, due to the
relatively gentle southern branch system, the warm and humid air flow was weak
and the precipitation level was small. The purpose of this study is to better understand
a large-scale cold air weather process in January 2021 in China.
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