How to write snow, solar terms and snow?

Light snow: the snowfall process in which the snowfall is less than 1.0mm within 12 hours (equivalent to melting rainfall, the same below) or less than 2.5mm within 24 hours.

Medium snow: 12 hour snowfall1.0 ~ 3.0mm, or 24-hour snowfall of 2.5 ~ 5.0mm or snow depth of 3cm.

Heavy snow: the snowfall process in which the snowfall is 3.0 ~ 6.0mm in 12 hour or 5.0 ~10.0mm in 24 hours or the snow depth reaches 5cm.

Extended data

Modern people mostly use cannons to put chemicals in shells, and then use cannons to shoot shells into the clouds. However, this method does not spray evenly, which wastes a lot of drugs and increases the cost of artificial snowfall. Some people put them in earth rockets and let them fly into the clouds to spray.

Generally speaking, the success rate of artificial snowfall is greater than that of artificial rainfall. Artificial rainfall can increase rainfall by about 20%, and artificial snowfall can increase rainfall by 30 ~ 40% in alpine regions. This is because in the alpine region, the temperature is low and the water vapor is easy to reach saturation. Meanwhile, snow crystals are easier to form than raindrops. As long as some crystal nuclei are artificially added to the atmosphere, it is easier to promote snowfall.