How is the usual rainfall converted?

Meteorology, rain and snow are called precipitation, precipitation is called precipitation, and the unit of precipitation is usually millimeters. 1mm precipitation refers to the water depth per unit area1mm. The area per mu is 666.7 square meters. So 1 mm precipitation is equivalent to an increase of 0.667 cubic meters of water per mu.

Every cubic meter of water is 1000 kg, so the precipitation of 1 mm is equivalent to watering about 650 kg of water per mu. According to the measurement, 5 mm rainfall can make dry land soak 3 cm -6 cm.

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. 1 mm. "Sometimes there is light rain" means that the weather is gloomy and sometimes there is short-term precipitation.

Extended data

"Shower" refers to the sudden start and end of summer precipitation, one big and one small, with heavy rainfall. "Thunderstorm" means a shower accompanied by thunder and lightning. "There is rain in some areas" means that precipitation occurs in a small area and its distribution is irregular.

According to the China Meteorological Bureau, the rainfall within 24 hours is called daily rainfall. Where the daily rainfall is below10mm, it is called light rain,10.0-24.9mm is moderate rain, 25.0-49.9mm is heavy rain, 50.0-99.9mm is rainstorm, and100.0-250.0mm is rainstorm.

Due to China's vast territory, a few areas have other provisions according to the specific conditions of this province. For example, in rainy Guangdong, if the daily rainfall exceeds 80 mm, it is called rainstorm; In Yan 'an, Shaanxi, where there is little rain, it is called rainstorm when the daily rainfall reaches more than 30 mm.

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