Henan was hit by a torrential rain. Why is it raining so hard?

Zhang Juan, a meteorologist from China Weather Network, said that this area was affected by the vortex system, the water vapor on the east side of the low altitude was constantly replenished, and the terrain of Taihang Mountain was uplifted, which caused such heavy rainfall.

According to the forecast of Henan Meteorological Observatory, July 20th to July 2nd1day is still the main precipitation period in Henan. From day to night on July 20, there were small to moderate rains and thunderstorms on cloudy days in the province, including heavy rains in parts of the north of the Yellow River, Sanmenxia, Luoyang, Pingdingshan, Xuchang, Shenhe, Zhengzhou, Kaifeng, Shangqiu, western Zhoukou and northern Nanyang, accompanied by heavy rain or heavy rain.

Characteristics of this precipitation process

First, it lasts a long time. /kloc-since July, 2007, there has been a large-scale heavy precipitation in Henan Province, the western and central and western regions of Henan Province for four consecutive days, and the heavy precipitation will continue. ?

Second, the accumulated rainfall is large. The average rainfall in the whole province is 1 13.5 mm, and the average rainfall in Zhengzhou, Jiaozuo and Xinxiang is 357 mm, 2 10.6 mm and 194.5 mm respectively. The maximum precipitation occurred in Huancuiyu, Xingyang City, which was 728.0mm.. ?

The third is large-scale heavy precipitation. There are 4098 rainfall stations with rainfall exceeding 50 mm, 100 mm, 1923 and 606 with rainfall exceeding 250 mm ...

Fourth, the heavy precipitation period is concentrated. The period of heavy precipitation mainly starts from the night of 18, with heavy rain, heavy rain and local heavy rain in the northern, central and western regions. ?

Fifth, it is extreme. Five stations, such as Songshan, Yanshi, Xinmi, Yichuan and Dengfeng, have broken through the historical extreme value of daily precipitation since the station was established. Five stations, including Songshan, Gongyi, Xinmi, Yanshi and Dengfeng, have broken through the historical extreme value of accumulated precipitation for three days since the station was established.