Light rain, moderate rain, heavy rain, rainstorm. What is the measure?

The meteorological department calls it rain and snow precipitation, and precipitation is called precipitation. The unit of precipitation is usually millimeters. 1mm precipitation refers to the water depth per unit area1mm.

/kloc-how much of the 0/mm precipitation fell into the fields? As we know, the area per mu is 666.7 square meters, so the precipitation of 1 mm is equivalent to an increase of 0.667 cubic meters of water per mu. Every cubic meter of water is 1000 kg, so the precipitation of 1 mm is equivalent to watering about 650 kg of water per mu. According to the measurement, the rainfall of 5 mm can make the dry land soak for 3 ~ 6 cm.

In the weather forecast issued by the meteorological department, we often hear professional terms such as light rain, moderate rain and heavy rain. What's the difference between them?

Light rain refers to rain in which the precipitation does not exceed 10mm within 24 hours, ranging from moderate rain 5-18mm, moderate rain10-25mm, moderate rain18-38mm, heavy rain 25-50mm and heavy rain 38-75mm ... If 24. If it exceeds 100 mm, it is called a torrential rain; If it exceeds 200 mm, it is called rainstorm.

In weather forecast terminology, different expressions have different meanings. For example, "sporadic light rain" means that the precipitation time is very short, and the precipitation does not exceed 0. 1 mm. "Sometimes there is light rain" means that the weather is gloomy and sometimes there is short-term precipitation. "Rainfall" refers to the sudden start and end of summer precipitation, one big and one small, with heavy rainfall. "Thunderstorm" means a shower accompanied by thunder and lightning. "There is rain in some areas" means that precipitation occurs in a small area and its distribution is irregular.