The biggest snow in Tianjin is "11.7" mm, right?

The amount of snow is measured by meteorological observers after melting the collected snow in a certain standard container, and the unit is millimeter. In the weather forecast, the snowfall of different intensities is mainly measured by the snowfall. Generally speaking, within 12 hours, sporadic light snow appears when the snowfall is less than 0. 1 mm, light snow appears between 0.1-0.25mm, medium snow appears between 0.25-3mm, heavy snow appears between 3-5mm, and blizzard appears above 5mm.

Snow depth and snowfall are two completely different concepts in weather forecast. The depth of snow refers to the thickness of snow in a certain time before melting, in centimeters, which is a numerical value that can be accumulated and changed with the deepening of snow. The depth of snow on the ground depends on the snowfall and temperature, which is calculated on the general open and flat ground. The snowfall and snow depth can be converted according to the ratio of 1: 15. In this way, the snowfall of 10 mm is about 15 cm thick snow.