China's hailstorms occur in the spring, summer and fall seasons, April to July accounted for about 70% of the total number of occurrences. The more serious hailstorm areas are southern Gansu, Longdong region, Yinshan Mountains, Taihang Mountains and the western part of Sichuan and Yunnan provinces.

Hail is a solid precipitation. Department of spherical or conical ice, composed of transparent and opaque layers. Diameter is generally 5 to 50 millimeters, the largest up to 10 centimeters or more, the larger the diameter of hail, the greater the destructive power. Hail often damaged crops, threatening the safety of people and animals, is a serious natural disaster, a lot of hail damage to the country has carried out artificial hail test.

Hail comes from convective clouds (cumulonimbus clouds) where convection is particularly strong. Cloud updrafts to be stronger than the general thunderstorm clouds, small hail is in the convective cloud by hail embryo up and down several times and the cold water droplets touch and grow up, when the cloud updrafts can not support when it falls to the ground. Large hail is produced in thunderstorm clouds with a strong oblique updraft and abundant liquid water content.

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