Why does it always rain in Tomb-Sweeping Day?

1. Before and after Tomb-Sweeping Day, winter goes and spring comes, and the cold air weakens. The subtropical high at sea moves westward, and the warm and humid air flow moves northward actively. Cold and warm air currents often meet in the south, resulting in rainy weather in the south.

2. In spring in the south, there is a lot of low pressure. In low pressure, the clouds are fast, the wind is strong and the rain is urgent. Every time there is a low-pressure crossing, there will be rainy weather.

3. Before and after Tomb-Sweeping Day, the warm and humid air flow from the ocean was continuously imported into the mainland, and the water vapor in the atmosphere would cool and condense into Mao Mao rain at night. Moreover, there are many low pressures in spring, and the clouds in the low pressure go very fast. Whenever the low pressure passes by, there will be rainy weather, so there are many rainy days in Tomb-Sweeping Day.

During Tomb-Sweeping Day, there was not only much rain, but also changeable weather. It is often at noon, and it is still sunny, which makes people feel that "the warm wind makes tourists drunk". But at night, the cold air suddenly went south, making people feel cold, as if they were back in winter. Therefore, there is a saying that "you must bring three seasons clothes when you go out in spring", which makes the most appropriate metaphor for the changeable weather in spring. In fact, it is really necessary to travel.

It often rains around Tomb-Sweeping Day every year, and this year is no exception. From April/KLOC-0 to next weekend, most of the south will be covered with rainy weather. Therefore, Du Mu, a poet in the Tang Dynasty, said in a poem: "There are many rains during the Qingming Festival, and pedestrians on the road want to break their souls." .