Authoritative forecast: local snowstorm in the north, wind, rain, snow and dust all come together. Is the strong cold air mass really coming in March?

In March, the second wave of strong cold air appeared again. This wave of cold air has also developed for three days, but its influence range is much larger than the first wave, and the coverage of wind, rain and snow is also wider. This is the largest temperature change and rain and snow weather phenomenon in China since March.

Strong cold air is really rare in March, and it will appear in previous years, but it is generally not so strong, and this is the second wave in March. According to the forecast of the Climate Center, the next wave of strong cold air will appear around March 26th, so it will develop before the end of March this year.

Judging from the climate situation in China in the last five days, most parts of the country have maintained a warm pattern, among which only Xinjiang and other places are about 4 degrees lower, while most parts of the northeast and south are still 6 degrees higher, which is really hot. This wave of cold air will cool down, and from north to south, there will be cold air development in China, so there will also be what we call "cold spring", and the southern region will be the key area. Let's look at the specific situation. As can be seen from the weather map, the "cold high pressure" in northern China is very obvious, with two cold air activities of 1045 HPA, and the air flow of cold air also entered a large area in northern China.

Therefore, some areas also have "low pressure" systems, which are relatively rare, mainly creating the foundation for the emergence of "rain and snow". Judging from the cooling range of cold air, there will be cooling in southwest, south of the Yangtze River, south China and other places, and some areas can reach 10 degrees or above, and Guizhou and Chongqing are the main affected areas. Guangdong, Fujian, Guangxi and other places have shorter cooling intervals, which is the trend of cold air. March 19 sunrise, continue to move south. By March 2 1 day, although the main cold air activities stopped, the residual forces still affected most parts of the south.

On March 19, the main snowfall was distributed in Northeast China and North China, especially in Shanxi, Inner Mongolia, Hebei, Heilongjiang, Jilin and other places, with heavy snow in some areas. At this time, the rainfall is in the southern region, mainly concentrated in Zhejiang, Jiangxi, Guizhou and other regions, and there are heavy rains in some areas.

By March 20, the intensity of rain and snow will gradually escalate. In the forecast of the Central Meteorological Observatory from 08: 00 to 2: 00108: 00 on March 20, we can see that Heijiliao and other places have been completely covered by rain and snow, while the rain is still the heaviest in the south, which is much smaller than the original forecast.

March 2 1 is the end period, and the rain and snow basically disappeared, only in a small area in the northeast, and the rain and snow in the south basically stopped. This is the overall rain and snow situation. Generally speaking, from March 19 to March 2 1, the rain and snow in the central and eastern regions cooled in a large scale, which is the overall situation. Of course, although it rains constantly in the south, there is still no rain in the main rainfall areas, that is, Yunnan, Guangdong and other large areas. These two provinces still have little rain, so it remains to be seen how long it will take to alleviate the rainy Qinghai.

When cold air is active, strong winds and cold air masses will once again affect the sandstorm weather in China. According to the forecast of the Central Meteorological Observatory, six provinces and regions will reappear, including western Inner Mongolia, southeastern Xinjiang and southern Xinjiang basin, northern and eastern Qinghai, north-central Gansu, north-central Ningxia and northwestern Shaanxi. The strongest sandstorms are in Inner Mongolia and Xinjiang, so just pay attention. It is normal for sandstorms to occur this season, and it will not be as strong as the last wave.