What weather will hail appear in?

Hail is also called "hail", commonly known as hail and bully. It is called "cold child" in some areas (such as Xuzhou and Gansu) and is a weather phenomenon, which is most common in summer or at the turn of spring and summer. It is some ice particles as small as mung beans and soybeans and as big as chestnuts and eggs.

The water on the local surface is evaporated by sunlight and then rises into the air. A lot of water vapor condenses into clouds. The relative humidity at this time is 100%. When it meets cold air, it will liquefy, and the dust in the air will condense, forming raindrops (tropical rain) or ice crystals (mid-latitude rain), which are getting bigger and bigger. When the temperature drops to a certain extent, the water vapor in the air will be supersaturated, so it will rain. if

Every year, all parts of China are hit by different degrees of hail. Especially in the mountainous and hilly areas in the north, the eastern part of the Qinghai-Tibet Plateau and the Yunnan-Guizhou area, the terrain is complex, the weather is changeable and there are many hail, which is very harmful to agriculture. Heavy hail destroyed crops and houses, injured people and killed livestock. Extraordinary hail is bigger than grapefruit, which will kill people, destroy a large area of farmland and trees, and destroy buildings and vehicles. It has powerful lethality. Hail disaster is one of the serious natural disasters in China.

Extended data In the hail cloud, the strong updraft carries many large and small water droplets and ice crystals, some of which fuse with the ice crystals and freeze into larger ice particles. These particles and supercooled water droplets are transported by the updraft to the water content accumulation area, which can become the hail core. The initial growth core of these hailstones has good growth conditions in the water content accumulation area.

After the hail enters the growth area with the updraft, it collides with supercooled water droplets in the area with large water volume and low temperature, and grows into a transparent ice layer, and then enters the low temperature area with small water volume, where it is mainly composed of ice crystals, snowflakes and a small amount of supercooled water droplets, and the hail adheres to them and freezes to form an opaque ice layer.

At this time, the hail has grown up and the updraft there is weak. When it can't support the growing hail, the hail will fall in the updraft and continue to grow through the fusion of ice crystals, snowflakes and water droplets in autumn. When it falls to a higher temperature area, the supercooled water droplets that hit it will form a transparent ice layer.

At this time, if it falls into another stronger updraft area, the hail will rise again and repeat the above growth process. In this way, hail grows in transparent layer and opaque layer; Due to the differences in growth time and water content, the thickness and other characteristics of each layer are also different. Finally, when the updraft couldn't support the hail, it fell from the clouds and became the hail we saw.

Raindrops in the clouds meet with the violent rising airflow and are taken to the upper air below 0℃ to liquefy into small ice beads; The airflow weakens and the small ice beads fall back; When the updraft containing water vapor increases again, the small ice beads rise again and increase; So jumping up and down, the small ice beads may gradually turn into hail and finally fall to the ground.