What are the characteristics of cold wave?

Cold wave usually occurs in late autumn, winter and early spring, and has different characteristics in different geographical environments: in the northwest desert and loess plateau, it is characterized by less wind and snow, which is easy to lead to sandstorm weather; In Inner Mongolia grassland, it is windy, snowy and cold weather; In North China and Huanghuai areas, cold waves are often accompanied by snow. In the northeast, it is characterized by more violent winds and heavy snow; Jiangnan is often accompanied by freezing rain.

Cold wave is a large-scale strong cold air activity process, which is mainly characterized by severe cooling and strong wind, sometimes accompanied by rain, snow and freezing. However, not every cold air activity is a cold wave. According to the national standard of cold air grade, a cold wave weather process can only be called if the temperature drops to 8℃ within 24 hours, or to 10℃ within 48 hours, or to 12℃ within 72 hours, and the daily minimum temperature is below 4℃. Cold wave weather generally occurs from late autumn to early spring, starting in late September at the earliest and ending in May the following year at the latest, with the most frequent activities in March and June 10 and June10 in spring.