What is the yellow warning level of hail?

The yellow warning of hail is a three-level warning, and the disaster level is heavier.

Hail, also known as "hail", commonly known as hail, is a weather phenomenon, which is most common in summer or at the turn of spring and summer. Hail is a hard spherical, conical or irregular solid precipitation. It is some ice particles as small as mung beans and soybeans and as big as chestnuts and eggs.

Hail warning levels include red, orange and yellow, of which the yellow level is level 3, which is a serious disaster.

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

If you encounter cold air without condensation nuclei, water vapor will condense into ice or snow, which is snow. If the temperature drops sharply, it will form a bigger ice mass, which is hail.

Harm caused by hail

Hail disaster is a serious meteorological disaster caused by strong convective weather system. Although it appears in a small range and in a short time, it is fierce and strong, and is often accompanied by other weather processes such as strong winds and heavy rains. China is a country with frequent hail disasters. Hail brings huge losses to agriculture, construction, communication, electricity, transportation and people's lives and property every year.

Many people have encountered hail in thunderstorm weather. Usually, these hailstones will not exceed the size of softball, they fall from the storm clouds. However, sometimes the hail is very heavy. Once 80 kg of hail fell from the sky and broke into many small pieces when it landed on the ground. The most mysterious thing is that when the sky is cloudless, huge hail falls from the sky. There have been many incidents that confirmed that the wing of the plane was hit by hail, and scientists still can't explain why there was such a huge hail.

Reference to the above content: Baidu Encyclopedia-Hail