How are light rain, moderate rain, heavy rain and rainstorm divided?

Light rain, moderate rain, heavy rain and rainstorm are divided as follows:

In a certain period of time, the depth of rain falling to the horizontal ground (assuming no leakage, evaporation, loss, etc. ) It's called rainfall. Daily rainfall is the total rainfall of an area within 1 day. In addition, there are annual rainfall, monthly rainfall and how many hours of rainfall. If the daily rainfall is accumulated, the ten-day rainfall, monthly rainfall and annual rainfall can be obtained respectively. Secondary rainfall refers to the total amount of continuous rainfall from the beginning to the end of a certain rainfall.

Extended data:

According to the definition of China Meteorological Bureau, light rain refers to daily precipitation p≤ 10 mm, which can be subdivided into micro-precipitation (there is precipitation, but there is no specific numerical record), P ≤ 1 mm d- 1 (light rain) and 1

The study of light rain with different intensity levels shows that the frequency of micro-precipitation is decreasing all over the country except for a few stations in the south of the middle reaches of the Yangtze River, while the frequency of light rain in summer of 196 1-2005 is obviously reduced, and the reduced area is not limited to semi-arid areas, but widely exists in the east of100 E.

The researchers divided the light rain into 0.1~ 0.3mm d- 1 and 0.4 ~ 0.9mm d- 1, and found that the light rain decreased mainly by 0.1~ 0.3mm d- 1, and 0.4 ~ 0.

For 1

The smaller the P value of daily precipitation, the more significant the decrease of precipitation and precipitation frequency in recent decades, and this decrease does not only occur in summer.

References:

Baidu encyclopedia-Xiaoyu