In July, 20021year, Zhengzhou City, Henan Province was repeatedly hit by heavy rain, which attracted the attention of netizens. 19 At 2 1: 59 pm on July 6th, Zhengzhou Meteorological Bureau issued a rainstorm red warning signal. On the morning of 20th, Director Li Kexing issued at least three rainstorm red warning signal. On July 20th, many topics, such as "Henan rainstorm" and "Zhengzhou Metro Line 4 becomes water curtain cave", boarded the hot search in Weibo.
Causes of floods in Henan Province
The causes of this serious flood in Henan are both man-made and natural disasters. The severe flood in Henan province is related to the current global climate disorder and atmospheric circulation disorder. Under normal circumstances, "fireworks" should land from Zhejiang. Because of the continuous high temperature in Fujian, Guangdong and its coastal areas since the spring, the high-temperature heat wave hit the atmosphere, causing changes in atmospheric circulation, and the subtropical high moved northward, forcing the "fireworks" to change direction and move northward along the coastline.
The west is blocked by Taihang Mountain, and the north meets the afterglow of cold vortex airflow, which causes fireworks to carry a lot of water vapor, concentrated in northern Henan and southern Hebei. Climatic conditions and geographical and environmental factors prevented the diffusion of water vapor carried by fireworks, and concentrated landing led to once-in-a-century heavy rainfall in the above two areas, which was a natural disaster.