How much rain can it rain in a second?

According to China's meteorological regulations, heavy rainfall with a precipitation of more than 50 mm in 24 hours is called "rainstorm". Due to the different characteristics of precipitation and topography, the standards of rainstorm and flood are different in different places. Rainstorm is a kind of disastrous weather, which often causes floods and serious soil erosion, leading to major economic losses, such as engineering accidents, dike breaches and crop flooding.

Heavy rain is rain with strong precipitation intensity. It is raining cats and dogs. Generally, it refers to the precipitation with hourly rainfall greater than16mm, or12h continuous rainfall greater than 30mm, or 24h continuous rainfall greater than 50mm.

According to China's meteorological regulations, rain with a precipitation of more than 50 mm in 24 hours is called "rainstorm". According to its precipitation intensity, it is divided into three grades, that is, the 24-hour precipitation is 50 ~ 99.9 mm, which is called "rainstorm"; /kloc-rainstorm below 0/00 ~ 250 mm; More than 250 mm is called "rainstorm".

Due to the different characteristics of precipitation and topography, the standards of rainstorm and flood are different in different places. Rainstorm is a kind of disastrous weather, which often causes floods and serious soil erosion, leading to major economic losses, such as engineering accidents, dike breaches and crop flooding. Especially for some low-lying and closed terrain areas, rainwater can not be discharged quickly, resulting in farmland water accumulation and soil water supersaturation, which will cause more disasters.

The world's largest rainstorm occurred in Reunion Island in the South Indian Ocean, with a 24-hour precipitation of 1.870 mm, and the largest rainstorm in China occurred in Xinliao, Taiwan Province Province, with a 24-hour precipitation of 1.672 mm, all caused by tropical cyclone activities. China is one of the countries with the most rainstorms in the world, and almost all provinces (cities, districts) have rainstorms. Mainly concentrated in the second half of the year. The regional distribution of rainstorm days is obviously more in the south and less in the north; There are many coastal areas and few inland areas; There are many windward slopes and few leeward slopes. The annual rainstorm days in mountainous areas of Taiwan Province Province are more than 16 days, Dongxing, Yangjiang, Shanwei and some coastal areas of South China are more than 10 days, and the average in northwest China is less than 1 day.

Assuming that the rainfall of 50 mm is evenly distributed within 24 hours, it gives people the feeling of Mao Mao rain. If the precipitation of 9 mm is completed within one minute, it will give people the feeling that the sky is falling, which is beyond the description of rainstorm. 9 mm is only a light rain. Everything is relative and has its specific background. The standard of rainstorm in some parts of southern China is basically set at 80mm/24h, but just like the new typhoon standard in China, the definition of rainstorm needs to be further improved.