How much precipitation does a heavy rainstorm have? What does the precipitation level refer to?

Recently, all parts of the country have ushered in the rainy season, and sometimes there are extreme phenomena. Excessive rainfall can cause natural disasters, such as heavy rains. Heavy rains can cause rivers to overflow and cause floods. It will have a huge impact on agriculture and fisheries, destroy crops and facilities, and affect people's normal work. So for the sake of our production and life, it is recommended to learn more about this aspect.

Contents of this article

1. How much precipitation does a heavy rainstorm have?

2. What is the precipitation level in a place?

3. What is the unit of precipitation?

How much precipitation does a heavy rainstorm have?

More than 250 mm. Light rain refers to rain with a precipitation of no more than 10 mm in 24 hours, light to moderate rain is 5 mm to 16.9 mm, moderate rain is 10 mm to 24.9 mm, moderate to heavy rain is 17 mm to 37.9 mm, heavy rain is 25 mm to 49.9 mm, and heavy to torrential rain is 38 mm to 74.9 mm. Rainfall exceeding 50 mm in 24 hours is called torrential rain, exceeding 100 mm is called heavy torrential rain, and exceeding 250 mm is called extremely heavy torrential rain. Weather forecasts call rain and snow precipitation, and the amount of precipitation is called precipitation. The unit of precipitation is usually millimeters. 1 mm of precipitation means 1 mm of water depth per unit area. How much does 1 mm of precipitation fall on the field? The area of ​​​​one acre of land is 666.7 square meters. Therefore, 1 mm of precipitation is equivalent to an increase of 0.667 cubic meters of water per acre of land. Each cubic meter of water is 1,000 kilograms, so 1 millimeter of precipitation is equivalent to about 650 kilograms of water per mu of land. It has been determined that 5 millimeters of rain can soak dry land by 3 to 6 centimeters.

Precipitation level refers to the amount of precipitation in a place.

The rainfall level is divided according to the depth of the water layer in a place, and the unit used for measurement is the rainfall in 24 hours. The rainfall level can be divided into light rain, moderate rain, heavy rain, rainstorm, and heavy rainstorm. Excessive rainfall will lead to a series of natural disasters, such as floods. The rainfall time is not necessarily continuous, and is generally calculated in minutes and hours.

The rainfall level is divided according to the depth of the water layer on a unit area of ​​a place's 24-hour rainfall. Generally, light rain means less than 10 mm of rainfall in 24 hours; moderate rain means 10-25 mm of rainfall in 24 hours; heavy rain means 25-50 mm of rainfall in 24 hours; torrential rain means 50-100 mm of rainfall in 24 hours, and heavy rain means 100-259 mm of rainfall in 24 hours.

Excessive rainfall can cause natural disasters, such as heavy rain. Heavy rain can cause rivers to overflow and cause floods, which can have a huge impact on agriculture and fisheries, destroy crops and facilities, and affect people's normal work. Floods in my country are basically caused by heavy rain.

The rainfall time is not necessarily continuous. The rainfall time refers to the length of time relative to a certain rainfall amount. The rainfall duration and rainfall time are calculated in minutes and hours. The rainfall intensity refers to the rainfall per unit time, which is calculated in millimeters per minute or millimeters per hour.

What is the unit of precipitation?

The unit of precipitation is milliliter or liter/square meter, which mainly refers to rainfall and snowfall. In meteorology, the intensity of precipitation is differentiated according to the amount of precipitation, which can be divided into multiple levels such as light rain, moderate rain, heavy rain, rainstorm, heavy rainstorm, extremely heavy rainstorm, light snow, and blizzard. In addition, there are other ways to divide precipitation.

Precipitation refers to the depth of water that falls to the ground within a certain period of time. It is the basic data for measuring the amount of precipitation in a region. It is often expressed as annual precipitation, and the basic unit is millimeter (mm).

Precipitation is formed in two forms: solid precipitation and liquid precipitation according to different physical changes. Solid precipitation mainly refers to snow, hail, etc., liquid precipitation is the common various forms of rain, and solid-liquid mixed precipitation mainly refers to sleet.

Due to the different amounts of precipitation, the Meteorological Bureau divides it into several levels. The classification of rain is based on the size of the rain and the amount of precipitation within 24 hours. The standard for classifying snow is the amount of snowfall within 12 hours or 24 hours, as well as the depth of snow on the ground.

In addition to this classification method, precipitation is also divided into continuous precipitation, showery precipitation and intermittent precipitation based on the discontinuity of precipitation.