Is there a precursor to the rainstorm in Zhengzhou?

What is the rainstorm like in Zhengzhou? In July of 20021year, Zhengzhou City, Henan Province was hit by a rainstorm, which attracted the attention of netizens. On July 20th, many topics, such as "Rainstorm in Henan" and "Zhengzhou Metro Line 4 becomes water curtain cave", boarded the hot search in Weibo? . At 3: 00 on July 2 1 day, the Henan Provincial Defense Index decided to upgrade the emergency response level of flood control from level II to level I..

So what are the precursors of the rainstorm in Zhengzhou?

The first is the weather forecast. Now society should believe in science, and weather forecast is very important.

Second, look at the clouds. If funnel clouds or dragon tail clouds appear on the horizon, it means that the weather is extremely unstable and thunderstorms and strong winds may come at any time. The following two pictures were taken by netizens.

Temperature, sultry weather, and even difficulty breathing are generally signs that a low-pressure weather system is approaching, and heavy rainfall often occurs in the afternoon. The following picture was commented by netizens at that time.

Other rainstorm precursors:

Ants can predict the humidity of the air. When they feel that the humidity is too high, they know that it is going to rain, so they must move to a safer place. However, there is still no conclusive scientific evidence to prove this view.

For several days, the weather was fine, there was no cloud in Wan Li, and the temperature was very high. But suddenly I saw a small cloud on the windward slope, so there was usually a thunderstorm in the early morning.

I feel sultry when I get up in the morning, and even have symptoms of difficulty breathing. This is generally a phenomenon before the arrival of a low-pressure weather system, and there is usually heavy rainfall in the afternoon.

Swallows fly at low altitude, indicating that the weather is sultry and the air is humid. Insects feed on lowlands, and swallows feed on lowland insects. Therefore, it indicates that heavy rain is coming.

Chickens refused to get into their nests. Because they have no sweat glands and sebaceous glands, it is difficult to dissipate heat in a stuffy chicken coop, which indicates that a rainstorm is coming.

What caused the rainstorm in Zhengzhou?

The atmospheric circulation situation is stable: the western Pacific subtropical high and 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 in the central and western Henan.

Abundant water vapor conditions: In mid-July, Henan was on the edge of 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 typhoon periphery and the east-south airflow of subtropical high, a large amount of water vapor is transported to the inland areas of China, which provides a rich source of water vapor for heavy rainfall in Henan and has high precipitation efficiency.

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 uplift and convergence of easterly airflow, the heavy precipitation area is stable and less moving along the mountain in western and northwestern Henan Province, and the precipitation before windward slope increases obviously.

The "train effect" of convection is obvious: under the stable weather situation, the small and medium-scale convection develops repeatedly in front of Funiu Mountain and moves towards Zhengzhou, forming a "train effect", which leads to a large precipitation intensity and a long duration, resulting in extremely strong local precipitation.

Is the rainstorm in Zhengzhou over?

It is estimated that there will still be rain in Henan province in the next three days, with 2 1 day heavy rainfall, and there will be heavy rain in Zhengzhou city, with local heavy rain. The specific forecast is as follows:

2 1 day, there are heavy rains in the central, western and northern parts of Henan province, heavy rains in some parts of northwest China and local heavy rains; There is heavy rain in Zhengzhou area, with local heavy rain.

On the 22 nd, there was little to moderate rain in central and western Henan; There is little to moderate rain in Zhengzhou area.

On the 23 rd, it was small to moderate rain in central and western Henan; There are scattered showers in Zhengzhou area.

I hope this rainstorm will be over as soon as possible. Come on, Zhengzhou, Henan! !