The probability of precipitation indicates the size of precipitation.

The probability of precipitation indicates the possibility of precipitation.

The probability of precipitation refers to the percentage of the possibility of rainfall in a certain area, indicating the possibility of precipitation. For example, if the weather forecast says that there is a 70% chance of precipitation today, it means that there is a 70% chance of rain in this area.

Calculate precipitation probability according to meteorological principle and historical data. It reflects the influence of water vapor content, temperature and humidity in the atmosphere on precipitation. Generally speaking, when the probability of precipitation is high, it means that the weather conditions in this area are humid and prone to precipitation such as rain or snow; When the probability of precipitation is low, it means that the weather in this area is dry and the possibility of precipitation is small.

The probability of precipitation is only a forecast value, and the actual precipitation situation may change due to the influence of many factors. So you'd better check the latest weather forecast before going out and make corresponding preparations. At the same time, for some activities that need to avoid the influence of rain (such as outdoor sports, tourism, etc.). ), but also according to the probability of precipitation to make corresponding decisions.

The main reasons for the rainfall are as follows:

1, high water vapor content: When the water vapor content in the air exceeds the saturation point, clouds will form, which will lead to precipitation.

Temperature drop: When the air rises, the temperature will drop, causing water vapor to condense into water droplets or ice crystals, thus forming clouds and precipitation.

2. Changes in air pressure: Changes in air pressure will also affect the formation of precipitation. For example, in the low-pressure area, the air will rise upwards and the temperature will drop, which will lead to the condensation of water vapor into clouds and precipitation.

3. Terrain influence: Terrain will also affect the movement of airflow, thus affecting the formation of precipitation. For example, mountains will hinder the flow of air and force the air to rise, thus forming clouds and precipitation.

4. Seasonal change: Seasonal change will also affect the formation of precipitation. For example, in summer, the temperature is high and the water vapor content in the air is high, so heavy precipitation weather such as heavy rain is prone to occur in summer.

5. Cloud formation: When the water vapor content in the air exceeds the saturation point, clouds will form, which will lead to precipitation.

6. Formation and descent of raindrops: These small water droplets collide and merge constantly in the cloud to form large water droplets, which eventually become raindrops and descend from the cloud to the ground.