What are the forming conditions of freezing rain?

1. Freezing rain is a kind of disastrous weather in early winter or late winter and early spring, which is composed of ice-water mixture and freezes immediately after colliding with objects with a temperature lower than 0℃. Raindrops below 0℃ can remain supercooled in air with a temperature slightly lower than 0℃, and their appearance is the same as that of ordinary raindrops. When they fall on an object with a temperature below 0℃, they will immediately freeze into a smooth and transparent ice layer, which is called snowball. Severe snowstorms will crush trees and telephone poles, stop communication and power supply, hinder road and railway traffic, and threaten the flight safety of aircraft.

2. The formation of "freezing rain" often depends on certain weather conditions to make supercooled water droplets land on the ground smoothly: the temperature of the air layer about 2000 meters near the ground is slightly lower than 0℃; The temperature of the air layer from 2000 meters to 4000 meters is higher than 0℃, which is warmer; The upper layer is lower than 0℃, so the supercooled water droplets, ice crystals and snowflakes on the upper layer of the cloud fall into the warmer gas layer and become liquid water droplets. Further down, you will enter the frozen layer that is not too thick. When it continues to fall and is ready to freeze, it has already touched the cold object in the form of supercooling, forming a solid "freezing rain".

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