What does the blue weather warning mean?

The blue warning is the degree of danger of possible meteorological disasters, and the blue warning indicates the general level. When the blue warning appears, students should avoid outdoor activities as much as possible and can study and do homework at home.

According to the different weather, the blue warning has different expressions. Details are as follows:

1. Typhoon blue warning: it means that within 24 hours, it may or may have been affected by tropical cyclones, and the average coastal or land wind force is above 6, or the gust is above 8 and may continue.

2. Blue rainstorm warning:/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

3. Blizzard blue warning: 12 hours, the snowfall will reach more than 4 mm, or it has reached more than 4 mm and the snowfall continues, which may have an impact on traffic or agriculture and animal husbandry.

4. Cold wave blue warning: 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.

5. Gale blue warning: it may be affected by strong winds within 24 hours, with an average wind force of 6 or above or a gust of 7 or above; Or have been affected by strong winds, with an average wind force of 6-7, or gusts of 7-8 and may continue.

6. Frost blue warning: within 48 hours, the minimum ground temperature drops below 0℃, which has an impact on agriculture, or has dropped below 0℃, which has already had an impact on agriculture and may continue.

Extended data

Early warning signals are composed of names, icons, standards and defense guidelines, which are divided into typhoon, rainstorm, blizzard, cold wave, gale, sandstorm, high temperature, drought, lightning, hail, frost, fog, haze, road icing and so on.

The level of early warning signals is generally divided into four levels according to the degree of harm, urgency and development trend that meteorological disasters may cause: IV (general), III (heavier), II (serious) and I (particularly serious), which are indicated by blue, yellow, orange and red in turn.

The early warning signal is to forecast the weather through meteorological data such as wind direction, wind speed, air pressure, humidity and temperature near the ground and high altitude obtained by meteorological station staff through ground observation, high altitude observation, sea observation, radar observation and meteorological satellite observation. The staff quickly transmitted the meteorological data observed at the same time to the newspaper receiving center for analysis and made a weather map. Analyze the occurrence, development, weakening and disappearance of various meteorological conditions on the weather map.

Baidu Encyclopedia-Warning Level