The weather forecast says there will be heavy rain.

Generally, it is measured by the total precipitation within 24 hours, and there is also 12 hours, the magnitude of which is as follows:

Classification standard of precipitation intensity issued by China Meteorological Bureau

Classification of precipitation intensity: 24-hour total precipitation 12-hour total precipitation.

Light rain and shower 0. 1-9.9 ≤4.9

Light rain-moderate rain 5.0- 16.9 3.0-9.9

Moderate rain10.0-24.9 5.0-14.9

Moderate-heavy rain17.0-37.910.0-22.9

Rainstorm 25.0-49.9 15.0-29.9

Heavy rain-rainstorm 33.0-74.9 23.0-49.9

Rainstorm 50.0-99.9 30.0-69.9

Heavy rain-rainstorm 75.0-174.9 50.0-104.9

Rainstorm100.0-249.9 70.0-139.9

Heavy rain-rainstorm175.0-299.9105.0-169.9

Heavy rain ≥250.0 ≥ 140.0