There is a lot of snow! Snow has appeared in high-altitude mountainous areas in Beijing. Why does it snow this season?
On March 14th and 18th, 221, Beijing Meteorological Observatory issued forecasts one after another. It snows at high altitudes 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 of last year, especially after February 25th, the weather situation changed quickly, 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 struck, there was snowfall again. Next, let's analyze the cause of snowfall in detail.
look at the snowfall area first. Generally speaking, there are: Huatai in Puwa Township, Fangshan District, Hongshuikou Village in Qingshui Town, Mentougou, and Zhaitang Meteorological Station in Mentougou. These areas are mostly located in the suburbs of Beijing and high-altitude areas with an altitude of more than 1 meters. At high altitude, the influence of surface temperature on it is relatively small, and when the temperature rises, the convection will increase, and at the same time, due to the low surface temperature, rainwater will be turned into snowflakes to form snowfall.
secondly, let's talk about the reason 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 the dust particles in the air. When the condensed weight of water drops reaches a certain level, it will fall down and form precipitation. When the local surface temperature is too low, the rain drops 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 some parts of China entered the rainy season. The rain belts in Fujian and the Yangtze River have a wide radiation range, and precipitation in China has increased. In the north, it is still in early spring, but the temperature rises slightly, and the altitude in the suburbs of Beijing is high, resulting in snowfall. In addition, there are reasons that should be caused by local airflow movement. Beijing's terrain is high in the northwest and low in the southeast. After the humid air enters, it climbs some mountains in the northwest, and the cold air shrinks 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, let's 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 in the spring drought period. On the other hand, snowfall in Beijing will cause freezing damage to crops. It also affects people's travel to some extent. If the temperature does not rise, there may be ice on the road, which will greatly increase the probability of traffic accidents. Please be careful when you go out. Go slow in the snow.