Known as the "once in a thousand years" rainstorm, why is this rainstorm in Henan so serious?

As a natural disaster, how much damage will it bring to mankind? This is what no one thought of.

It has been like this for thousands of years, and it will be like this for thousands of years to come! Cities such as Zhengzhou have built once-in-a-century drainage systems, which is enough, but this rainstorm is once in a century. This is a hopeless and unpredictable thing. Heavy rain in Henan, critical in Zhengzhou.

The state quickly mobilized the rescue forces of neighboring provinces to go to Zhengzhou for rescue; Allocate disaster relief funds to help Zhengzhou tide over the crisis. The country has the strength to always take people's safety into consideration. With such a party and government, the people have a sense of security and a backer!

The rainstorm in Zhengzhou, Henan Province lasted for three days from 8 pm on July 17 to 8 pm on July 20, and the rainfall reached 6 17. 1 mm, which is said to be once in a thousand years. It once rained 20 1 .9 mm within1hour.

The usual annual rainfall is only 640.8 mm, but in July this year, it reached the usual annual rainfall in just three days! What is this sudden heavy rainfall related to? Of course, it has something to do with geographical environment, climate, tsunami, typhoon, earthquake, hot pressure convection, etc ...!

The main reason is that due to the subtropical high in the western Pacific Ocean, Chinese mainland is affected by the strong thermal pressure convection of typhoon fireworks, which leads to the change of circulation potential. Coupled with the dry cross product without rain for a long time, the steam pressure source of water flow is too high and the flow rate is insufficient.

The vortex airflow in Taihang Mountain and Funiu Mountain is affected by high-end heat flow. The excessive water vapor flow is consistent with the low transport of the easterly jet, resulting in the convergence and uplift of the easterly airflow between Funiu Mountain and Taihang Mountain. Moreover, the momentum in the northwest mountainous areas is relatively stable.

The flow is small and the terrain is under the windward slope, which makes the rainfall increase greatly. This is the cause of the flood in Henan, which killed 25 people and left 7 missing. 1, 240,737 people were affected.

In addition, the flood also caused many farmland waterlogging, crops flooded, roads, subways, shops and goods flooded, and street water pollution.

From this disaster, we can also see a lot, such as the people's soldiers rushed to the disaster area at the first time, the love of thousands of people in Qian Qian, and their unity and sincerity.

I have seen the spirit of China people's unity to overcome difficulties. Although the disaster is merciless, there is love in the world. A picture of a province in trouble and support from all directions. It is really touching and full of confidence in our country and people.