It snows in Changping, Beijing. Why does it snow in late spring?

Because good rain knows the season, when spring comes. It is common that precipitation occurs in the middle and lower reaches of the Yangtze River in spring. In fact, in late March this year, due to the strong southern system and abundant warm and humid airflow, it has been raining in the south of the Yangtze River from March 25th to yesterday, which can be described as continuous spring rain. ?

It is easy to understand that cold air produces snowfall. There is plenty of water vapor in the air in late March, and there is precipitation every day. On the night of the 27th, the cold air near the surface layer was strong and the atmospheric temperature was low. Usually liquid precipitation condenses into solid precipitation, and precipitation will become snowfall. On the contrary, when the temperature is high enough during the day, snowfall will turn into precipitation.

The ground temperature standards are different when it snows in different parts of the country. In Anhui and southern Jiangsu, the ground temperature should reach 3? Below, and this standard was just reached when cold air crossed the border in the early morning. On other days, because the temperature is high enough, only precipitation can be produced.

Say something popular: premise one, it's too cold up there? Obviously, the higher the altitude, the lower the temperature. Basically every 100 meters, the temperature drops 1 degree Celsius. Premise two,? Are there clouds of rain in the sky? Besides romance, it tells us that water vapor in the air, especially clouds, is mainly composed of water droplets and ice crystals.

After knowing a thing or two, let's look at the problem. The temperature is above zero. Why does it snow in Beijing? Regardless of the weather system, just say how it snows. First of all, there should be clouds in the snowfall, and the snowfall is mostly medium and low clouds, ranging from three to four kilometers to several hundred meters, which meets the water vapor conditions.

Secondly, the temperature near the ground is above zero. What about altitude? Often far below zero, the ground will freeze to below zero. Similarly, water vapor or water droplets at high altitude will condense and just become snowflakes with regular geometry. Finally, after the gas or liquid becomes a solid snowflake, it can't remain suspended and falls one after another, that is, the snowflake falls to the ground and melts in the future. As for what system will cause snowfall, if it is too much, when the temperature is low, frontal transit, cyclone, air trough line, etc. It is possible to snow, and there is another kind of snowfall called cold current low cloud snowfall.