Why did it rain for a whole year and three days in Henan?

Recently, the continuous rainstorm in Henan has brought heavy disasters to local residents, and there is a serious shortage of drinking water and food. The three-day heavy precipitation in Henan is mainly related to various geographical reasons such as air pressure, topography and airflow. Topographically, the rainfall is remarkable. Henan has flat terrain, fertile soil, mountainous northwest, windward slope and abundant precipitation. Abundant precipitation will lead to the accumulation of surface rainwater, which will cover basic public facilities. Secondly, the atmospheric circulation situation is relatively stable, and the subtropical high has been staying in the northwest of Henan Province, causing heavy precipitation, and it is always a rainstorm every three days. In addition, due to the influence of typhoon and airflow, a large amount of soda water was transported to Henan. Provide sufficient water for heavy rainfall in Henan. Strong and persistent airflow will lead to more rain and continuous heavy rain. Typhoon weather is more serious, which can transport water vapor from the coast to the inland, so it will lead to abundant precipitation. In addition, heavy rain has seriously damaged people's houses in Henan, and the drainage system in Henan should be improved. Because the accumulation of rain will only bring more intense harm. There are also many star enterprises that have contributed their modest efforts to the rescue of rain disasters in Henan. I hope Henan can get through the crisis as soon as possible. The precipitation in the original area of Henan is normal. The relatively strong precipitation in these three days is also caused by various geographical reasons such as topography, air pressure and climate. The special geographical location may make its rainfall increase continuously. Although it is inconvenient for Henan people to travel at home because of the heavy rain, which has affected the normal life order, I believe that after the storm, Henan will be able to tide over the difficulties smoothly, not to mention the unity of the whole country. Moreover, it is reported that there will be heavy rainfall in the middle and lower reaches of the Yangtze River in recent days, so everyone should take precautions in advance. Heavy rain and heavy rainfall are natural disasters, and the losses caused by it can only be minimized. I hope Henan can get through the crisis quickly.