How long will the rainstorm in Zhengzhou last?

It is predicted that there will still be rain in Zhengzhou in the next three days (7.2 1-7.23), of which 7.2 1 has the largest intensity and then begins to weaken. 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 (50 ~ 120mm).

On the 22 nd, there was little to moderate rain in central and western Henan; There is little to moderate rain (5 ~ 15mm) in Zhengzhou area.

On the 23 rd, it was small to moderate rain in central and western Henan; There are scattered showers (1 ~ 5mm) in Zhengzhou area.

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In view of the rainstorm in Zhengzhou, I will give some suggestions first, and then sort out the reasons slowly.

Therefore, the extreme rainstorm in Zhengzhou is of great significance (up to 200mm/h). The accumulated precipitation is large and lasts for a long time, which causes many small reservoirs and rivers to exceed the flood limit water level, so try not to get close to them under any circumstances.

In addition, due to the continuous heavy precipitation, the water content of mountain soil will increase sharply to a certain extent, so we must pay attention to a series of secondary disasters such as landslides. Especially children and the elderly, don't go near the mountain.

If it is not necessary, everyone should be prepared to "squat at home", at least when the waterlogging in the city is not so serious, then go out.

Then there is the reason for the heavy rain in Zhengzhou. As a matter of fact, the rainstorm had certain signs as early as five days ago. At that time, the meteorological department of Jiaozuo, Henan Province issued an urgent notice. Although the specific location of the forecast has some deviation, the magnitude of the forecast at that time was equivalent to 72 1 rainstorm, which could reach 500 mm

However, the magnitude of 500mm is indeed larger than that of ordinary rainstorm (it is generally considered that daily precipitation of 50mm is called rainstorm in meteorology), which was once considered as forecast deviation. However, it turns out that there really is.

The specific reasons are mainly related to adequate water vapor supply and energy release caused by strong convective instability.

This year is actually La Nina year, which means that the subtropical high will be stronger and northerly. The northward subtropical high will lead to a rare high temperature in the northeast, and there is sufficient water vapor content in the atmosphere.

At the same time, there will be a water vapor channel on the south side of the subtropical high, which will continuously input water vapor from the ocean to North China, providing sufficient water vapor for the rainstorm in Zhengzhou.

Coupled with the generation of typhoon fireworks, it further provided sufficient water vapor and strong convective unstable conditions for Zhengzhou, which further caused continuous heavy rain in Zhengzhou.

Finally, the total rainstorm is expected to last for one week. I hope friends in Zhengzhou must protect themselves! ! !