What early warning does the cold wave weather include?

Lead: China's meteorological department can forecast the cold wave in advance, so that people can do the corresponding anti-freezing work. There are some early warnings for the cold wave, so what are the early warnings for the cold wave? What early warning does the cold wave weather include?

What are the early warnings for the cold wave?

The cold wave warning signal is divided into four levels, which are represented by blue, yellow, orange and red respectively.

① Cold wave blue warning signal. Standard: within 48 hours, the minimum temperature drops by more than 8℃, the minimum temperature is less than or equal to 4℃, and the average wind power on land reaches above 5. Or it has dropped by more than 8℃, the lowest temperature is less than or equal to 4℃, and the average wind power reaches more than 5, which may continue.

② Cold wave yellow warning signal. Standard: within 24 hours, the minimum temperature drops 10℃ or above, the minimum temperature is less than or equal to 4℃, and the average wind power on land can reach 6 or above. Or it has dropped above 10℃, the lowest temperature is less than or equal to 4℃, and the average wind force is above 6, and it may continue.

③ Cold wave orange warning signal. Standard: within 24 hours, the minimum temperature drops 12℃ or above, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach above 6. Or it has dropped above 12℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.

(4) Cold wave red warning signal. Standard: within 24 hours, the minimum temperature drops 16℃ or above, the minimum temperature is less than or equal to 0℃, and the average wind power on land can reach 6 or above. Or it has dropped above 16℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.