The weather forecast says there will be heavy snow.

Light snow: It means that the horizontal visual distance is equal to or greater than 1000 m when it snows, the depth of snow on the ground is less than 3 cm, the precipitation level is 24 hours, and the snowfall is between 0. 1 ~ 2.4 mm..

Snow: refers to the horizontal visual distance between 500 ~ 1000m when it snows, the depth of snow on the ground is 3 ~ 5cm, and the snowfall in 24 hours is 2.5 ~ 4.9 mm. ..

Heavy snow: refers to the poor visibility when it snows, the horizontal visual distance is less than 500 meters, the depth of snow on the ground is equal to or greater than 5 cm, and the snowfall in 24 hours reaches 5.0 ~ 9.9 mm.

If there is snowfall without forming snow, it is generally called "sporadic light snow".

When the snowfall reaches 10.0 ~ 19.9 mm in 24 hours, it is a blizzard, 20.0 ~ 29.9 mm is a blizzard, and more than 30.0 mm is a blizzard.