Guiyang Meteorological Station Releases Orange Hail Warning Signal

At 18:24 on January 1, 2024, Guiyang Meteorological Observatory will issue the orange hail warning signal in Yunyan District and Nanming District: it is expected that in the next three hours, hail weather may occur in all towns (streets) in Yunyan District and all towns (streets) in Nanming District, which may cause hail disaster. It is suggested that livestock and agriculture should pay attention to protection and park vehicles in safe places, Personnel take shelter in safe places; Pay attention to the prevention of lightning, strong wind and other disastrous weather that may accompany hail weather; Relevant units should take precautions according to the Guidelines for Meteorological Disaster Prevention.

What's the matter with hail in winter?

Usually, people think that "hail" usually occurs in summer. Then, will it hail in winter?

First of all, we need to understand how hail is formed. Hail is commonly known as "hail". Its formation principle is similar to that of snow in winter. First, the surface water is evaporated into the air by the sun, and then it will condense into clouds when it accumulates to a certain extent. Right now, the humidity is 100%. When encountering cold air, the vapor of water will change from gas to liquid, forming condensation nodules with the dust in the air, If the temperature is relatively high, raindrops will form; if the temperature is low, condensation nodules will form.

In general, whether raindrops or raindrops or ice crystals are formed, they will fall when they reach a certain degree. Raindrop falling is rain, and ice crystals falling is snow. However, if ice crystals accumulate a lot and encounter a sudden drop in temperature when falling, large ice clusters will fall, which is hail.

According to the above formation conditions, winter can also be formed. Why is it that winter is less and summer is more? We should not neglect an important condition, that is, the humidity must reach 100%, which we also have in the formation of fog. The winter weather is dry and it is difficult to reach 100% humidity. The humidity is high in summer, and the supply of water vapor will keep rising, so it is easy to reach 100%. When water droplets and ice crystals in the cumulonimbus cloud formed by water vapor are stirred and mixed by the rising air flow, and slowly accumulate to form an ice mass to fall, it is hail.

You may think that this summer is so hot, how can it form an ice ball? Will it not melt during landing? You should know that the heat on the ground is not equal to the heat in the sky, and the ice mass is a large piece of ice, which is not snow. A small piece of ice is easy to melt. It takes a certain time for the ice mass to melt, and it takes a while for the ice we usually eat to melt slowly.

Hail is harmful, it is a natural disaster. Because of its solid appearance, and some of its large size, once it falls in large numbers, it will hurt people or damage crops and buildings, and has a great impact on traffic. Excessive hail accumulation on the road will hinder traffic, and serious water will appear when it melts. We must pay attention to prevention.

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