It rained in succession during the Qingming Festival, so the little friends who went out for outings must pay attention to keeping warm and taking umbrellas. It always rained before and after the Qingming Festival. Do you know why? The reason why it rained before and after the Qingming Festival is that Xiaobian came to popularize science for you today.
Before and after the Qingming Festival, there are more water vapor in the atmosphere in the south of the Yangtze River, which tends to condense into drizzle at night. Because of these reasons, there are many rainy days in Qingming. But it's not that Qingming Festival is bound to rain, but Qingming Festival is a rainy season.
From the characteristics of Qingming solar term to Qingming solar term, the atmospheric circulation in East Asia has changed from winter to spring. The trough ridge of the westerly belt moves frequently, and the low and high pressure alternately appear. The variation range of cold and warm in Jianghuai area is large, and the unstable precipitation such as thunderstorm is increasing gradually. Qingming is not only a solar term but also a festival. It is also called the March festival in ancient times. It has a history of more than 2000 years. 'when all things grow, they are clean and clear. So it is called Qingming. 'after the Qingming Festival, the rain increased, and everything turned from Yin to Yang. It was like spring and Jingming.
"Rain in Qingming" refers to the climate characteristics of the south of the Yangtze River. At this time, it is often cloudy and sunny. Abundant water can generally meet the needs of crop growth. What is annoying and can not be ignored is the damage of wet spots and lack of illumination caused by too much rain. In the vast area to the north of the Huang Huai plain, the precipitation is still very little in the Qingming period. For the crops and spring sowing, the water supply is often in short supply. At this time, the rain is very valuable. These areas should do well in spring irrigation at the same time of water storage and moisture preservation to prevent the threat of spring drought.
Why does Qingming Festival always rain?
It's raining in Qingming. I believe everyone knows this poem. It's easy to rain every time we arrive at this season. It's also inconvenient for people who go to visit graves.
Reason one
Every year, the Qingming Festival is around April 5. It's the time when winter goes to spring. The power of cold air is not so strong and gradually weakened. At this time, the subtropical high began to strengthen its westward extension, and the warm and humid air on the ocean began to move northward, eager to try. The cold and warm air often converged in the south, which caused the rainy weather in the south.
Reason two
In the spring of Jiangnan, there is a lot of low pressure. The clouds in the low pressure go very fast, the wind is very strong, and the rain is very urgent. Every time the low air pressure passes by once, there will be gloomy and rainy weather.
Reason three
Before and after the Qingming Festival, the warm and humid air flow from the ocean constantly transports to the mainland. There is more water vapor in the atmosphere, which is easy to condense into drizzle in the evening. Because of these reasons, there are many rainy days in Qingming.