How is the hail formed? Why does the climate like Hainan hail?

First of all, hail is a kind of severe convective weather (if you don't know what severe convective weather is, please pay attention to the precipitation in Shili Wei Yun, and there will be relevant knowledge answers on WeChat official account). We say that the formation of convective rain needs cumulonimbus clouds, but the cumulonimbus clouds here are very high (not less than 6 to 8 kilometers). There are strong updraft and downdraft in the cloud, and there are very rich water vapor in the cloud, which will produce and form hail. This kind of cloud is usually called hail cloud.

In the hail cloud, the strong updraft carries many large and small water droplets and ice crystals. When these water droplets and ice crystals rise to the area where water vapor gathers, the hail core will be formed, which provides good conditions for the formation of hail.

When these ice cores reach the area where the temperature is not very low but there is a lot of water, they will absorb a lot of water vapor and condense on the surface, and the weight of the ice cores will increase and sink. In the process of sinking, the strong updraft is brought to the area rich in water vapor, and the water vapor is adsorbed and condensed. After this cycle for several times, when the hail becomes an updraft, it will fall from the clouds and form hail.

Second, the causes of hail in Hainan:

The formation of hail can not be separated from hail cloud, which is a kind of cumulonimbus cloud and is formed by strong updraft rich in water vapor precooling at high altitude. In summer, the temperature is high, the ground evaporation is strong and the water vapor is sufficient; At the same time, due to the high temperature, the updraft is significant.

It is with these two important conditions that it is possible to form hail clouds. Coupled with other conditions such as unstable atmosphere, even Hainan, where the weather is hot, is more likely to form hail.