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Heavy, medium and light rain signs are as follows:

The amount of rainwater is classified by the depth of rainwater falling on the horizontal ground within a certain period of time (assuming no leakage, evaporation, loss, etc.) Grading of rainwater.

Daily rainfall is the total amount of rainfall that falls on a certain area in one day. In addition, there are often annual rainfall, monthly rainfall and hourly rainfall, etc. If the daily rainfall accumulation is added up, the ten-day, monthly and annual rainfall can be obtained respectively. Rainfall refers to the total amount of continuous rainfall from the beginning to the end of a certain rainfall.

Rainfall is measured with a rain gauge or rain gauge, in mm.

Rainfall observation can be divided into 4 types: 24 segments (once every 1 hour), 8 segments (once every 3 hours), 4 segments (once every 6 hours) and 1 segment (once every 24 hours).

Extended information

Grading of rainfall

Light rain: rainfall less than 10mm in 1d (or 24h).

Moderate rain: 10-25mm rainfall in 1 day (or 24 hours).

Heavy rain: 25-50mm rainfall in 1 day (or 24 hours).

Heavy rain: 50 to 100mm of rainfall in 1 day (or 24 hours).

Heavy rainstorm: 100~200mm of rainfall in 1 day (or 24 hours).

Extremely heavy rain: rainfall exceeding 200mm in 1 day (or 24 hours).

Light snow: a snowfall process in which the snowfall amount within 12 hours is less than 1.0mm (equivalent to the amount of melted rainwater, the same below) or the snowfall amount within 24 hours is less than 2.5mm.

Medium snow: a snowfall process in which the snowfall amount is 1.0~3.0mm within 12 hours, or the snowfall amount is 2.5~5.0mm within 24 hours, or the snow depth reaches 3CM.

Heavy snow: a snowfall process in which the snowfall amount is 3.0~6.0mm within 12 hours, or the snowfall amount is 5.0~10.0mm within 24 hours, or the snow depth reaches 5CM.

Blizzard: A snowfall process in which the snowfall amount is greater than 6.0mm within 12 hours, or the snowfall amount is greater than 10.0mm within 24 hours, or the snow depth reaches 8CM.

Heavy blizzard: a snowfall process in which the snowfall amount is greater than 12.0mm within 12 hours, or the snowfall amount is greater than 20.0mm within 24 hours, or the snow depth reaches 16CM.

Extremely heavy snowfall: a snowfall process in which the snowfall amount is greater than 24.0mm within 12 hours, or the snowfall amount is greater than 40.0mm within 24 hours, or the snow depth reaches 32CM.

Baidu Encyclopedia-Weather Symbols