Under what circumstances will it snow?

Snowfall must meet the following two conditions:

1, the atmosphere needs to contain cold ice crystal nuclei.

2. Sufficient water vapor. Below 3.0℃ (freezing point). If the cold air is quite strong and carries moisture, it can snow at the temperature of 1℃ to 10℃. ?

Water vapor in the atmosphere condenses directly or water droplets condense directly, which is snow. It can also be said that it snows when the temperature in the cloud is too low and small water droplets form ice crystals and fall to the ground or snow. Ice absorbs heat when it melts, so the ground temperature will be lower than when it snows.

Extended data:

Hazards of snow:

Snowstorm is a natural disaster that causes large-scale snow, snowstorm and avalanche due to snowfall, which seriously affects the survival and health of people and animals, or damages transportation, electricity and communication systems. Snowstorm, as one of the major natural disasters in China, occurs every year, seriously threatening people's lives, property and normal life order.

According to the formation conditions, distribution range and manifestations of snow disasters, the types of snow disasters are generally divided into avalanche, wind-blown snow (snowstorm) and snow disasters in pastoral areas. Among them, snow-capped mountains are prone to avalanche disasters, and wind blowing snow will block the normal passage of highway traffic.

Snow disaster in pastoral areas is a natural disaster that livestock can't eat normally due to thick snow, long-term maintenance and burying pasture, which leads to the weight loss and death of a large number of livestock in pastoral areas. This is the most frequent and severe snowstorm in China. In high-latitude and high-altitude areas, especially in Inner Mongolia, Xinjiang, Qinghai, Tibet and other major pastoral areas with vast natural grasslands, such disasters will occur to varying degrees almost every year.

In addition, under the background of global changes, China's vast rural areas, forest areas and towns are often affected by short-term snowfall, and serious snowstorms will also destroy infrastructure such as transportation and communication, resulting in the loss of houses and crops.

Baidu encyclopedia-snow

People's Network-Too much snowfall is harmful, and "Xue Rui" can be a "bumper year"