There is a lot of snow! Snowfall has occurred in high-altitude mountainous areas in Beijing. Why does it snow this season?

On March/March/2002 14 and 18, Beijing Meteorological Observatory issued forecasts one after another. It will snow at high altitude in Beijing, and the amount of snow is not small. It's already spring March, and the weather is getting warmer, but it's still snowing in Beijing.

Generally speaking, after the end of February last year, especially after February 25, the weather situation changed rapidly and the temperature rose rapidly, which even led to the spring drought in the north, accompanied by sandstorms and other phenomena. But this year, after the sandstorm hit, there was snowfall again. Next, let's analyze the reasons for snowfall in detail.

First look at the snowfall area. Generally speaking, there are Huatai in Puwa Township of Fangshan District, Hongshuikou Village in Qingshui Town of Mentougou, and Zhaitang Meteorological Observatory in Mentougou. Most of these areas are located in the suburbs of Beijing and at high altitudes above 1000 meters. At high altitude, the surface temperature has little influence on it, and the convection will be enhanced when the temperature rises. At the same time, due to the low surface temperature, the rain will turn into snowflakes to form snowfall.

Secondly, talk about the cause of snowfall. Before that, let's take a look at what snowfall is, or how it is formed: snowfall is just a form of precipitation. When the moisture content in the air is too high, it will combine with dust particles in the air. When the condensed weight of water drops reaches a certain level, it will fall down and form a precipitate. When the surface temperature is too low, raindrops will condense into solids, which is snowfall or hail. Although the precipitation in Beijing looks abnormal, it can't escape these factors. In February, the National Meteorological Administration issued a notice that parts of China entered the rainy season. The rain belts in Fujian and the Yangtze River radiate widely, and the precipitation in China increases. It's still early spring in the north, but the temperature has risen slightly, and the altitude in the suburbs of Beijing is high, which leads to snowfall. In addition, it should be caused by local airflow movement. The terrain of Beijing is high in the northwest and low in the southeast. After the wet air entered, it climbed some mountains in the northwest, and the cold air contracted to form this snowfall. In addition, Beijing is a megacity with dense population and concentrated heat, which caused local snowfall. This is the so-called? Cold spring? .

Finally, talk about the impact of this snowfall. On the one hand, for Beijing's air quality, snowfall is also a kind of precipitation, which greatly improves Beijing's air quality. Secondly, it sent water resources to Beijing, which was originally a spring drought. On the other hand, snowfall in Beijing will cause freezing damage to crops. It also affects people's travel to a certain extent. If the temperature does not rise, the road surface may freeze, which will greatly increase the probability of traffic accidents. Please be careful when you go out. Walk slowly in the snow.