What does the cold wave blue warning mean?

Cold wave blue warning is an early warning signal issued when the cold wave comes, and the blue warning signal is the first level in the cold wave early warning signal.

The China standard of cold wave blue warning is that the minimum temperature will drop by more than 8℃ within 48 hours, 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. The early warning shall be issued by the meteorological bureau authorized by the meteorological station at the same level, and the time limit is usually more than 24 hours.

Other early warning

In addition to the blue warning, there are yellow, orange and red warnings for cold wave warning.

1 yellow warning signal

Standard: within 24 hours, the minimum temperature will drop by more than 10℃, the minimum temperature is less than or equal to 4℃, and the average wind power on land can reach above 6. 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.

2, orange warning signal

Standard: within 24 hours, the minimum temperature will drop by more than 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.

3. red warning signal

Standard: within 24 hours, the minimum temperature will drop by more than 16℃, 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 16℃, the lowest temperature is less than or equal to 0℃, and the average wind force is above 6, and it may continue.