What is the concept of precipitation per hour 1000 mm?

One-hour rainfall 1000mm refers to rainstorm.

The meteorological department calls it rain and snow precipitation, and precipitation is called precipitation. The unit of precipitation is usually millimeters. 1mm precipitation refers to the water depth per unit area1mm.

Light rain refers to rain with the precipitation not exceeding10mm within 24 hours, ranging from 5mm to18mm,10mm to 25mm, moderate to heavy rain to18mm to 38mm, and heavy rain to 38mm to 75mm ... If the rainfall exceeds 50mm within 24 hours, it is called rainstorm; If it exceeds 100 mm, it is called a torrential rain; If it exceeds 200 mm, it is called rainstorm. ?

Extended data:

Precipitation factors:

1. location: it is mainly the influence of land and sea location on precipitation, and the mainland is usually dry and rainy.

2. Atmosphere: It mainly includes the influence of atmospheric circulation, front, cyclone (anticyclone) and other factors on precipitation.

3. Terrain: there is more precipitation on windward slope and less precipitation on leeward slope; High terrain will also prevent water vapor from entering. For example, the reason for the dry climate in Xinjiang is not only the inland depths, but also the blocking of water vapor by the surrounding mountains.

4. Ocean current: Warm current can warm and wet coastal climate; The cold current flowing through the coastal climate can reduce temperature and humidity.

5. Vegetation and hydrological conditions: in areas with high vegetation coverage and around lakes, swamps and reservoirs, the air humidity is relatively high and the relative precipitation is relatively high.

6. Human activities: urban wet island effect is how easy it is for urban updraft to form clouds and cause rainfall; The rain island effect is that the city has more dust, more condensation nuclei, more fog and low clouds than the effective area.

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