It seems to rain before and after the Qingming Festival every year, as if to cater to the atmosphere of tomb sweeping. Therefore, the friends who go out for outings must pay attention to keeping warm and take umbrellas. It always rains before and after the Qingming Festival. Do you know why? Why do you like rain before and after the Qingming Festival? Today I'll come to popularize science for you.
Before and after the Qingming Festival, there was more water vapor in the atmosphere of Jiangnan, which was easy to condense into drizzle at night. Because of these reasons, it rained a lot during the Qingming Festival. But it's not that it's bound to rain on Tomb Sweeping Day, but it's a rainy season.
The characteristics of Qingming solar term to Qingming solar term, the East Asian atmospheric circulation has realized the transformation from winter to spring. The trough ridge of westerly belt moves frequently, and the low-level high-low pressure appears alternately. The change range of cold and warm in Jianghuai area is large, and the unstable precipitation such as thunderstorm increases gradually. Qingming is not only a solar term but also a festival. In ancient times, it was also called March Festival, with a history of more than 2000 years. All things are clean and clean when they grow. So it is called Qingming. "After the Qingming Festival, the rain increased, and everything changed from Yin to Yang.
"Rainy in Qingming Festival" refers to the climate characteristics of Jiangnan. At this time, it is often cloudy and sunny, and abundant water can generally meet the needs of crop growth. What is troubling and can not be ignored is the harm of wet and little light caused by too much rain. However, in the vast area to the north of the Huang Huai plain, there is still little precipitation during the Qingming Festival. For the growing crops and spring sowing, the water is often in short supply. At this time, the rain is very precious. In these areas, we should do well in spring irrigation at the same time of water conservation, so as to prevent the threat of spring drought.
Why does it always rain on Tomb Sweeping Day?
It rains a lot during the Qingming Festival. I believe we all know this poem. It's easy to rain every time it comes to this season. It's also inconvenient for those who go to the grave.
Every year Qingming Festival is around April 5, when winter comes to spring, the influence of cold air is not so strong, and gradually weakened. At this time, the subtropical high began to strengthen its westward extension, the warm and humid air on the ocean began to be active and moved northward, eager to try, and the cold and warm air often converged in the south, resulting in the overcast and rainy weather in the south.
The second reason
In the spring of Jiangnan, there is a lot of low pressure. The clouds in the low pressure walk very fast, the wind is very strong, the rain is very urgent. Every time the low pressure passes through once, there will be cloudy and rainy weather.
The third reason
Before and after the Qingming Festival, warm and humid air from the ocean was constantly transported to the mainland. There was more water vapor in the atmosphere, which was easy to condense into drizzle at night. Because of these reasons, it rained a lot during the Qingming Festival.