What does a clear rain in April mean?

In April, there is more rain in Tomb-Sweeping Day.

It is a common climate phenomenon that rain falls in succession during the Qingming period. According to meteorologists, this situation is mainly caused by three factors: during the Qingming period, the cold air gradually weakened, and the warm and humid airflow on the ocean gradually became active; There are many low pressures in spring; Moreover, there is more water vapor in the atmosphere before and after Qingming, and the temperature difference between day and night is large.

With the arrival of Tomb-Sweeping Day, the cold air gradually weakened, and the warm and humid air flow on the ocean gradually became active. This airflow often moves from south to north, bringing enough water vapor, so the possibility of rain will increase at this time. In addition, because China is located at the intersection of the two atmospheric circulation systems of Eurasia and the Pacific Ocean, Tomb-Sweeping Day is also an important period of temperature and precipitation transition.

The reason for the rain in Tomb-Sweeping Day.

There are more water vapor in the atmosphere before and after Tomb-Sweeping Day, and the temperature difference between day and night is large, which is also one of the reasons for frequent rain. During this period, as the temperature rises gradually in spring, the humidity will also rise, forming a lot of water vapor. In addition, due to the large temperature difference between day and night, it is easy to form convection, which will also promote the formation and fall of rainwater.

To sum up, the rainy season is the result of the interaction of many factors. In addition to the above reasons, there are other complex meteorological phenomena that will also affect precipitation, such as stationary front and cold vortex. Static front refers to the pressure boundary line that stays in the same area or swings back and forth, which usually causes precipitation. Cold vortex is a strong and low-pressure weather system, usually accompanied by cold air and unstable weather conditions, which may lead to weather phenomena such as cooling, strong wind and precipitation.