What are the conditions for snow and hail?

First of all, the atmospheric temperature must be low enough. Contrary to popular belief, the temperature does not need to be below zero to form snow. The required temperature is 2? Below.

Because snow is composed of water vapor in the atmosphere, there is a simple logic that water vapor should exist. Finally, ice crystals must collide to form larger ice crystals, called snowflakes. The reason for the last request is simple. In order to form snow, ice crystals must fall to the ground. However, their weight is not enough to be pulled by gravity.

Conditions of hail:

1. There must be a rather thick unstable layer in the atmosphere.

2. Cumulus clouds must develop to a height that can freeze a single large water drop (the general temperature is-12 ~- 16℃).

There must be strong wind shear.

4, the vertical thickness of the cloud is not less than 6 ~ 8 kilometers.

5. The water content in the cloud is rich, generally 3 ~ 8g/m, and there is an accumulation area of liquid supercooled water above the rising speed.