Heilongjiang province issued a red warning of blizzard. How is the level of blizzard divided?

Blizzard blue warning was issued for the first time this winter. Faced with this weather, we can only reduce our losses. Relevant departments should do a good job in disaster prevention and mitigation to avoid casualties caused by heavy snow. Heilongjiang has issued 20 snowstorm warnings in a row, and also issued a red blizzard warning for the whole province. What is the classification of snowfall? In fact, the snowfall is not divided according to the thickness of the snow on the ground, because the size, shape and density of the snow falling on the ground are different, so the snowfall is divided according to the amount of water after the snow melts, and it is divided into multiple grades from low to high.

There are roughly the following grades of snowfall: light snow: 12 hours with snowfall less than 1.0 mm; Medium snow: 12 hours snowfall is 1.0 ~ 3.0mm or 24 hours snowfall is 2.5 ~ 5.0mm heavy snow: 12 hours snowfall is 3.0 ~ 6.0mm or 24 hours snowfall is 5.0 ~10.0 mm; Blizzard: The snowfall in 12 hours is more than 6.0mm or 24 hours is more than 10.0mm, while in Heilongjiang and other places, the snowfall is sometimes much greater than 10mm, so two concepts are introduced, namely, heavy blizzard: the snowfall process with 20.0-30.0mm snowfall in 24 hours, and heavy blizzard.

So once the level reaches blizzard and above, what we need to do is to do a good job in disaster prevention and mitigation, and at the same time avoid casualties caused by blizzard. Therefore, before the arrival of the blizzard, the relevant departments should sprinkle industrial salt on the roads to prevent serious road icing and prevent traffic accidents and pedestrian injuries. In addition, the impact of blizzard on agriculture is also very great, which may cause crops to be frozen, and it is also possible that heavy snow will collapse the greenhouse.