Why does it rain heavily in Henan?

Typhoon: Although the distance from China 1000 kilometers, Typhoon Fireworks remotely controlled the rainstorm in Henan. Under the guidance of "fireworks" and subtropical high, a large amount of water vapor is continuously transported from the sea to the land through the east wind, and it gathers into rain in Henan. Topographic reasons: After the easterly airflow meets Taihang Mountain and Funiu Mountain in Henan Province, it converges and rises in front of the mountain, resulting in concentrated rainfall range and strong rainfall.

1, Typhoon: Although the distance of Typhoon Fireworks is 0/000km from China/kloc-0, it remotely controlled the rainstorm in Henan. Under the guidance of "fireworks" and subtropical high, a large amount of water vapor is continuously transported from the sea to the land through the east wind, and it gathers into rain in Henan.

2. Topographic reasons: After the easterly airflow meets Taihang Mountain and Funiu Mountain in Henan Province, it converges and rises in front of the mountain, resulting in concentrated rainfall range and strong rainfall.

3. The general circulation situation is stable: the subtropical high in the western Pacific and the continental high are maintained in the Sea of Japan and the northwest of China respectively, which leads to the stagnation of the low-value weather system between them in Huanghuai area, resulting in long-term precipitation weather in central and western Henan.

4. Rich water vapor conditions: In mid-July, Henan was on the edge of the subtropical high, and the convective instability energy was sufficient. /kloc-on 0/8, the typhoon "fireworks" was generated in the western Pacific and approached China. Under the guidance of the airflow around the typhoon and east of the subtropical high, a large amount of water vapor is transported to the inland areas of China, and the precipitation efficiency is high.

5. The effect of topographic precipitation is remarkable: due to the influence of deep easterly jet and low vortex shear weather system, and the special topography of Taihang Mountain and Funiu Mountain in Henan Province has a convergence and uplift effect on easterly airflow, the heavy precipitation area is stable and less moving along the mountain in western and northwestern Henan Province, and the precipitation before the windward slope of the terrain increases obviously.

6. The "train effect" of convection is obvious: under the stable weather situation, the small and medium-scale convection in the front area of Funiu Mountain develops repeatedly and moves towards Zhengzhou, forming a "train effect", which leads to large precipitation intensity and long duration, resulting in extremely strong local precipitation. Typhoon: Although the distance from China 1000 kilometers, Typhoon Fireworks remotely controlled the rainstorm in Henan. Under the guidance of "fireworks" and subtropical high, a large amount of water vapor is continuously transported from the sea to the land through the east wind, and it gathers into rain in Henan. Topographic reasons: After the easterly airflow meets Taihang Mountain and Funiu Mountain in Henan Province, it converges and rises in front of the mountain, resulting in concentrated rainfall range and strong rainfall.