What does the cold wave blue warning mean?

The blue warning signal of cold wave is an early warning signal made by meteorological department before the arrival of cold wave through meteorological monitoring, reminding people to avoid cold wave and agriculture to minimize the losses caused by cold wave. Cold wave blue warning signal is the first level of cold wave warning signal.

Within 48 hours, the minimum temperature dropped by more than 8℃, the minimum temperature was less than or equal to 4℃, and the average wind power on land reached 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.

Extended data:

According to the regulations of China's meteorological department, if the temperature drop caused by cold air intrusion reaches more than 10 degrees Celsius and the lowest temperature is below 5 degrees Celsius in one day, it is called a cold wave process.

But in fact, this standard does not apply to southern provinces. Therefore, a supplementary regulation has been added: the temperature in the middle and lower reaches of the Yangtze River and its northern area will drop 10 degrees Celsius within 48 hours, and the lowest temperature in the middle and lower reaches of the Yangtze River will be below 4 degrees Celsius (the lowest temperature in Jianghuai area will be below 4 degrees Celsius in spring).

Strong winds of magnitude 5 or above have appeared in all three administrative regions on land, and strong winds of magnitude 7 or above have appeared successively in Bohai Sea, Yellow Sea and East China Sea, which are used as early warning standards for cold waves. If the temperature drops more than 14 degrees Celsius in the above-mentioned areas within 48 hours, there are 3-4 large administrative areas on land with strong winds of magnitude 5-7, and all coastal areas have strong winds of magnitude 7 or above, it is the standard of strong cold wave.

Baidu encyclopedia-? Cold wave blue warning