What is the rainfall of the rainstorm?

Different departments have different standards for the classification of rainfall grades.

Heavy rain generally refers to the rain with high precipitation intensity, and the meteorological department of China stipulates that:

(1)1hour rainfall 16 mm above the rain;

(2) rainfall of more than 50 mm within 24 hours; Heavy rain has the characteristics of "concentration" and "high intensity". As soon as it appeared, it poured down, causing water accumulation in the depression, sudden increase in runoff and rapid rise of the river in a short time. This is a severe and disastrous weather.

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 summer half 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.