How is the thickness of snow calculated in the weather forecast?

Snowfall is the value measured by meteorological observers after the snow collected in 12 hours or 24 hours is turned into water in a standard container, and the unit is millimeter. The amount of snowfall is strictly regulated in meteorology, which is completely different from the standard of rainfall. Snowfall is a measure measured by meteorological observers after melting the collected snow in a certain standard container.

The depth of snow is obtained by measuring the unmelted snow in the meteorological observation field, and the vertical depth from the snow surface to the ground is taken in centimeters, which is a numerical value that can be accumulated and constantly changed with the deepening of snow.

Classification standard of snowfall and the corresponding relationship between snowfall and snow depth

The classification of snowfall levels is usually based on the fact that snowfall melts into water and turns into precipitation within a specified time. Within 24 hours, when the snowfall is converted into precipitation of 0. 1 ~ 2.4 mm, it is light snow, 2.5 ~ 4.9 mm is medium snow, 5.0 ~ 9.9 mm is heavy snow, and when the precipitation reaches or exceeds 10 mm, it is blizzard ... The corresponding relationship between snowfall and snow depth: Generally, when the snowfall does not melt after landing, the northern region