What is disastrous weather, including what?

Problem description:

What's the disastrous weather like in China? What kinds are included?

Analysis:

1. Tropical cyclone: according to the maximum wind force near its center, it can be divided into four types according to the current domestic regulations:

(1) tropical depression: the maximum wind force near the center is less than 8 (wind speed is less than17.2m/s);

(2) Tropical storm: the maximum wind force near the center reaches 8-9 (wind speed17.2-24.4m/s);

(3) Severe tropical storm: the maximum wind force near the center reaches 10- 1 1 (wind speed is 24.5-32.6m/s);

(4) Typhoon: The maximum wind force near the center 12 or above (the wind speed is above 32.7m/s). (See attached table for details)

2. Strong wind: refers to the strong wind that is caused by non-tropical cyclones and the average wind force is above Grade 6 (wind speed10.8-13.8m/s).

Strong winds at sea transmit information through typhoon signals. China's typhoon signal suspension standards are as follows (see page 184).

3. Rainstorm: refers to the precipitation with a total precipitation of more than 50 mm within 24 hours. According to the amount of rainfall, the national unified standard is divided into three levels: rainstorm (50.0-99.9 mm), heavy rainstorm (100.0-249.0 mm) and extremely heavy rainstorm (250.0 mm or more).