What levels of disasters do the four colors in the weather forecast represent?

Blue warning signal of blizzard: 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.

2. Yellow warning (heavier)

Yellow rainstorm warning signal: The rainfall will reach more than 50 mm within 6 hours, or it has already reached more than 50 mm and the rainfall may continue.

3, orange warning (serious)

Rainstorm orange warning signal: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

4. Red alert (especially serious)

Rainstorm in red warning signal: within 3 hours, the rainfall will reach 100 mm or above 100 mm and the rainfall may continue.

Extended data:

The Hong Kong Observatory began to use the color rainstorm warning system on 1992. The system operates independently and has nothing to do with other meteorological early warning systems.

At that time, the rainstorm warning system was divided into two stages and three signals:

The first stage is the yellow rainstorm warning: the Hong Kong Observatory issued this warning based on the forecast that there may be more than 50 mm rainfall in Hong Kong in the next six hours. This is a warning signal to government departments and will not be announced to the public at this stage.

The second stage is the red rainstorm warning and the black rainstorm warning, which are signals issued according to the actual rainfall recorded in Hong Kong. The red rainstorm warning indicates that the rainstorm has begun. In the past hour, Hong Kong recorded more than 50 millimeters of rainfall. The black rainstorm warning indicates that the minimum rainfall of 100 mm has been recorded in the past two hours.

On March 28th, 1998, Hong Kong revised the rainstorm warning system, which has been in use ever since.

Baidu encyclopedia-weather forecast