Is the cold wave warning divided into blue, yellow, orange and red?

Yes, 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 can reach more than 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 reaches 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 above 12℃, 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 reaches 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.

Weather phenomenon caused by cold wave:

Cold wave brings frost, rain and snow, temperature drop, cold weather and other weather phenomena. After crossing the border, the air pressure rises and the temperature drops. Cold waves usually occur in late autumn, winter and early spring. Cold wave is strong cold air from the north, which is a serious disastrous weather process.

The meteorological department stipulates: "Due to the invasion of cold air, the temperature drops sharply to above 10℃ within 24 hours, and the lowest temperature on this day is below 5℃, which is called a cold wave." In the middle and lower reaches of the Yangtze River, strong cold air moves southward, causing the temperature to drop by more than 10℃ within 48 hours, also known as cold wave.