What does "precipitation 50 mm" mean in the weather forecast?

It means that precipitation is usually expressed in millimeters, and the precipitation of 1mm is 1mm per unit area.

But the concept of 1mm is still very narrow. For example, if 1mm rain falls on a hectare of land, then the area per mu of land is 666.7m2, and one millimeter of rain is equivalent to 0.667m3 of water added to Ceng Li, abel tamata, and each cubic meter of water is 1 1,000kg, so 1mm of water is equivalent to about 650kg of water.

According to the appraisal of relevant departments, 5 mm of rain can make dry land have 3-6 mm of water. However, the weather forecast issued by the Meteorological Bureau often contains professional terms such as light rain, moderate rain and heavy rain. The differences are as follows:

Light rain refers to rain in which the precipitation does not exceed 10mm within 24 hours, ranging from moderate rain 5-18mm, moderate rain10-25mm, moderate rain18-38mm, heavy rain 25-50mm, and heavy rain 38-75mm, 24.

In weather forecast terminology, different expressions have different meanings. For example, "sporadic light rain" means that the precipitation time is very short, and the precipitation does not exceed 0.1mm. "Sometimes there is light rain" means that the weather is gloomy and sometimes there will be short-term precipitation. "Rainfall" refers to the sudden start and end of summer precipitation, with a lot of light rain, and "thunderstorm" refers to showers accompanied by lightning.

Extended data:

related news

Affected by the high-altitude trough, from July 20, 2065438 to July 0, 2007, there were general thunderstorms in Tianjin, with moderate to heavy rain in most areas and heavy rain in some areas. Statistics show that the average precipitation in the city is 12.4 mm, reaching the level of moderate rain. The maximum rainfall occurred in Wenchang Street, Jizhou, with a rainfall of 73.7 mm, reaching the level of rainstorm. Rainfall is unevenly distributed.

The northern and eastern regions have basically reached the level of moderate to heavy rain, and some parts of the west have scattered moderate to heavy rain. The rainfall in the urban area is at least 1.8 mm. According to meteorologists, according to the rainfall, Jizhou is 26.7 mm, Binhai New Area is 18.5 mm, and Ninghe is 18. 1 mm, all of which are moderate rains, and Xiqing, Jinghai, Jinnan and Wuqing are 6.

According to meteorological monitoring and analysis, with the end of rainfall, the temperature in Tianjin rose rapidly on the 22nd. It is mainly cloudy today, with a northeast wind of 2-3, with a maximum temperature of 30℃ and a minimum temperature of 23℃. It is predicted that it will remain cloudy on Sunday, and there will be another obvious rain from evening to night. This rain will first appear thunderstorm weather, and then turn into moderate rain, and the overall rainfall can reach moderate intensity.

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