Use wechat to scan QR code < / P > < p > to share with friends and circle of friends < / P > < p > since July 17, persistent heavy rainfall has occurred in Henan Province, rainstorm and torrential rain have occurred in most parts of the province, heavy rainfall is mainly concentrated in the western, Northern and central regions, and torrential rain has occurred in Zhengzhou, Jiaozuo, Xinxiang and other 10 cities < p > photo source: China Weather Network < / P > < p > Zhang Ning, chief forecaster of Henan Meteorological Observatory, summarized the five characteristics of the precipitation process: long duration, large accumulated rainfall, wide range of heavy rainfall, concentrated period of heavy rainfall and extreme. Since July 17, there have been four days of heavy rainfall in the western and central and western regions of Henan Province, and the heavy rainfall will continue. There are 4098 rainfall stations in the whole province, with precipitation exceeding 50 mm, 1923 stations exceeding 100 mm and 606 stations exceeding 250 mm < p > on July 20, citizens waded on the streets of Zhengzhou. According to the reasons for the heavy rainfall, Zhang Ning said that the Western Pacific subtropical high and the continental high were respectively maintained in the sea of Japan and Northwest China, blocking the movement of the upstream system, resulting in the long-term maintenance of the westerly low value system in North China and the Huang Huai Region. Influenced by the deep easterly jet and the stable vortex shear, combined with the strong convergence and uplift effect of the special topography of Taihang Mountain and Funiu Mountain in Henan Province on the easterly flow, the heavy precipitation centers are mainly distributed in the western and northwestern mountain areas of Henan Province, which is stable and less dynamic, resulting in the long-term precipitation in Henan Province < p > at present, due to the long duration of precipitation and the concentrated area of heavy precipitation, the risk of mountain torrents and geological disasters in the western and northwestern mountainous areas of Henan Province is significantly increased, the water level of small and medium rivers and reservoirs in the Yellow River Basin and Haihe River Basin is rising rapidly, in addition, it also causes large-scale urban waterlogging and farmland waterlogging Zhang Ning said that the heavy rainfall is expected to last until the night of the 21st, and the concentrated area of heavy rainfall is still in Northwest and central Henan, with precipitation of 100-250 mm and 300-400 mm in some parts. 22 to 26, Henan Province, no obvious large-scale heavy rainfall weather, the province's scattered thunderstorm weather < p > forward diffusion! Henan rainstorm rescue the most full telephone announcement < / P > < p > many places in Henan are suffering from continuous heavy rain, if you need emergency rescue, please call the following number or take the topic words of Henan rainstorm rescue to release microblog for help, we will report to the emergency rescue department. Source: Xinhua news agency and Henan satellite TV microblog reporter: Sun Qingqing