Why does it hail in summer and seldom in winter?

It hails in summer because the weather is hot in summer, the temperature difference between the upper and lower floors is large, and the weather is cold in winter, which does not form conditions.

The formation of hail is caused by the rising of hot and humid air, and the hot weather in summer creates favorable conditions for its formation. In summer, the weather is hot, the temperature near the ground is very high, and the hot and humid air rises rapidly, but the temperature in the upper atmosphere is low, so the hot and humid air drops rapidly with the increase of the upper air temperature, condenses into water droplets when it meets cold air, and quickly freezes into small ice beads. Small ice beads rolled up and down in the clouds, absorbing the surrounding water droplets, then getting heavier and heavier, and finally falling from the sky. This is the formation process of hail. Therefore, the formation of hail depends on the updraft, and in winter, because the temperature is low and there is no condition for the formation of strong airflow, there are few hail.

Ice graupel is common in winter, also known as ice graupel? Little hail? . But there is a big difference between them. Hail is hard, with layers of ice shells, which can break the glass when hitting the glass window and make a loud landing sound; The essence of ice graupel is not hail, but snowball, which is a snowflake wrapped by cold water droplets in the process of falling. Loose and fragile, low dripping sound, not damaged by objects.

Hazards of Hail The lethality of Hail should not be underestimated. Although hail is generally a small-scale weather with a short time, it can not be ignored. It is fierce and brings huge losses to agriculture, construction and transportation. Hail is also accompanied by extreme weather such as heavy precipitation and strong wind, which brings unpredictable losses to economic and social development.

Agricultural losses are manifested in the mechanical damage to crops caused by hail in the process of falling objects, especially when the seeds bloom or mature seriously, which will lead to no harvest of particles, pests and diseases are likely to occur after the crops are damaged, which will increase the input cost of farmers; The loss of buildings is manifested in the huge gravity generated by hail falling from high altitude, which will damage buildings. Similar incidents have happened many times, and many houses collapsed instantly because of hail. Reconstruction or restoration requires a lot of financial, material and human resources. Hail can also lead to traffic jams and forced parking. This is unpredictable for the economy. In addition, in extreme weather such as hail, the lives of people or other animals will also be threatened.

In case of extreme weather such as hail, don't panic and keep calm. If you try not to go out indoors, don't go out until the hail stops. If you are outdoors, you need to put an umbrella or other items on your head to protect your head from heavy blows. If you are driving, park your car in a sheltered place and don't stay in an abandoned house for too long.