What is the summary of 202 1 Henan rainstorm?

From 20021July 16 to July 20 15, heavy rainfall caused 287,765,430 towns and villages in Zhengzhou, Luoyang, Pingdingshan, Anyang, Jiaozuo, Sanmenxia, Nanyang, Xinyang, Zhoukou and Zhumadian in Henan Province. The affected area of crops is 20 178.47 hectares, and the direct economic loss is 104604700 yuan.

At 20021July 18 17, Henan Provincial Water Resources Department has upgraded flood and drought disaster prevention to Class I emergency response. On July 20 17, the emergency response of flood control project was upgraded to level 1.

On July 19, the Gongyi Municipal Party Committee and Municipal Government launched a red warning in time to carry out the first-level emergency response to flood control. From July 20 18, the emergency response to flood control in Henan Province rose to Grade I. ..

Related introduction:

Heavy rain is a kind of natural weather, which refers to the rain with great precipitation intensity. According to China's meteorological regulations, rain with a precipitation of more than 50 mm in 24 hours is called "rainstorm".

The main physical conditions of rainstorm are abundant and continuous water vapor, strong and persistent upward movement of airflow and instability of atmospheric structure, which can be divided into three grades according to precipitation intensity: rainstorm, heavy rainstorm and extremely heavy rainstorm.

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".

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.

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.