The weather sign of the cold wave is

The cold wave weather process is a large-scale strong cold air activity process. Its weather is mainly characterized by severe cooling and strong winds, sometimes accompanied by rain, snow or frost.

Cold wave weather is a large-scale severe cooling phenomenon in the winter half year under the specific circulation situation at high latitude. Where cold air passes, there will be cooling, strong wind, rain, snow or freezing weather one after another, which has a wide range of influence. Heavy snow, freezing, heavy rain, etc. Causing traffic jams and telecommunication interruptions; Storm surges and capsizing accidents caused by strong winds in coastal areas; Strong cooling has the most serious freezing damage to crops, melons and tropical crops. The cold wave has a great influence on industrial and agricultural production and people's daily life. This is a disastrous weather.

The standard of cold wave:

Cold wave standard of Central Meteorological Observatory: the activity intensity of cold air is defined by process cooling and negative temperature anomaly. (Process cooling refers to the difference between the highest and lowest daily average temperature; Negative temperature anomaly refers to the difference between the lowest daily average temperature and the average temperature of the decade in which the day is located.

Cold wave is divided into four grades: regional cold wave, national cold wave, strong cold air and general cold air.