What is the standard of rainfall classification?

When we usually watch the weather forecast, we can often see that meteorologists use precipitation to classify the future. The so-called rainfall level refers to the depth of the water layer formed by falling to the ground within 24 hours. According to the different rainfall, it can be divided into: light rain 0. 1 mm to 9.9 mm, moderate rain 10 mm to 24.9 mm, heavy rain 25 mm to 49.9 mm, and heavy rain more than 50 mm. Besides the rainfall level based on the data, we can also judge the rain by observing the situation. Raindrops can be clearly divided into light rain, the rain line is moderate rain, the rain is blurred into heavy rain, the rain is continuous and majestic, and it is easy to accumulate deeply, and most of them are accompanied by strong winds.