Light rain rainfall is 5 mm, how many mm is moderate rain, heavy rain, rainstorm and rainstorm?
Rainfall means that the rainwater falling on the ground is not evaporated, infiltrated and lost, but is determined by the depth of accumulation. The unit of depth stipulated in our country is millimeter. The level of rainfall is divided into light rain, moderate rain, heavy rain, heavy rain, heavy rain and torrential rain according to the rainfall within 24 hours.
According to the regulations of China Meteorological Bureau, the rainfall within 24 hours is called daily rainfall. Any daily rainfall below10mm is called light rain,10.0 ~ 24.9mm is moderate rain, 25.0 ~ 49.9mm is heavy rain, 50.0 ~ 99.9mm is rainstorm, and100.0 ~ 250.0mm is rainstorm.
According to different physical characteristics, precipitation can be divided into liquid precipitation and solid precipitation. Liquid precipitation includes rain, rainstorm, thunderstorm, freezing rain and showers in Mao Mao. Solid precipitation includes snow, hail, sleet, etc. And liquid-solid mixed precipitation such as sleet.
Meteorology uses precipitation to distinguish the intensity of precipitation. It can be divided into: light rain, moderate rain, heavy rain, heavy rain, heavy rain, heavy rain, heavy rain, heavy rain, light snow, medium snow, heavy snow and blizzard.
Light rain: raindrops are clearly visible without floating; The ground does not splash; The water in the depression is slow; The rain on the house is weak, and there is only dripping water on the eaves; 12 hour precipitation is less than 5mm or 24 hour precipitation is less than10mm.
Moderate rain: the rain falls like a line, and the raindrops are not easy to distinguish; Fall heavily and splash; Water accumulated in depression is faster; There is rustling rain on the roof; 12 hour precipitation 5 ~10 ~ 25mm or 24 hour precipitation10 ~ 25mm.
Heavy rain: the rain falls like a downpour, blurred into pieces; The water in the depression is extremely fast; There is rain on the roof; 12 hour precipitation15 ~ 30mm or 24-hour precipitation of 25 ~ 50mm.
Rainstorm: Any rainfall process with precipitation exceeding 50 mm within 24 hours is collectively referred to as rainstorm. According to the intensity of rainstorm, it can be divided into three types: rainstorm, heavy rainstorm and extremely heavy rainstorm. Rainstorm: a rainfall process in which the precipitation is 30 ~ 70 mm in 12 hours or 50 ~ 100 mm in 24 hours. Rainstorm:/kloc-the rainfall process with precipitation of 70 ~ 100~250mm in 0/2 hours or precipitation 100~250mm in 24 hours. Extraordinary rainstorm: the rainfall process in which the precipitation is greater than140mm in 2 hours or 250mm in 24 hours.
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.
Blizzard: A snowfall process in which the snowfall is more than 6.0 mm within 12 hours or more than 10.0 mm within 24 hours or the snow depth reaches 8 cm.
Extended data:
Division of rainfall:
All the rain and snow falling within 6 hours melt into water, which is called 6-hour precipitation;
All the rain and snow falling within 24 hours melt into water, which is called 24-hour precipitation;
A ten-day rain and snow melts into water, which is called ten-day precipitation;
In a year, all the rain and snow fall into the water, which is the so-called annual precipitation.
The average annual rainfall of a place for many years is called the average annual rainfall of this place.
There are three types of daily variation of precipitation in China, namely, continental plain type, southeast coastal type and southwest mountainous type.
Continental plain type: this type is the most common, and the daily variation of rainfall in inland lowlands from south to north belongs to this type.
Features: Rainfall distribution is even day and night. The proportion of nights in spring and winter is slightly larger, but it decreases in summer and autumn.
Southeast coastal type: the daily variation of rainfall in the southeast coastal area is a standard ocean type, and its day and night distribution is generally uniform, but it is often concentrated in the early morning, and the rainfall is usually the lowest in the afternoon.
Southwest mountain type: the phenomenon that the eastern and northern slopes of southwest mountains such as western Sichuan and southeastern Sichuan live inland, but the rainfall is concentrated in the morning and evening.
The night rain rate in all parts of Sichuan and Guizhou is above 50%, and the proportion of time exceeding the standard is very large. There are two points to note:
1, the night rain rate tends to increase with height, which is related to the shadow of the terrain.
2. No matter high or low, the night rain rate is the smallest in summer, the largest in spring and not weak in winter.
References:
Baidu encyclopedia-rainfall