Why is spring the best time to fly kites?

"Children come back early from school and are busy flying kites in the east wind." In the spring of March, it is the annual time to fly kites. Chinese medicine believes that in spring, the yang of nature increases, and people should improve their yang. Flying kites is a good sport. In the eyes of modern meteorologists, the reason for flying kites in spring is not just to maintain yang. Then let the old calendar tell you why spring is the best time to fly kites.

Spring is the windiest season. Why is spring the best time to fly kites? Some people say it is not easy. It's warm in spring, and after a winter, I can finally come out for outdoor exercise. Meteorologists will tell you a scientific answer-the wind is strong in spring.

"Spring is the windiest season" is really not a casual remark. According to the climatic data, the wind in spring (March-May) is indeed the biggest in a year, especially in the north. Especially in April, from Xinjiang and Inner Mongolia to North China and Northeast China, the frequency of windy weather is relatively high. The average number of windy days is about 4 days, which can reach 6-8 days in some areas and 10 days in mountainous areas.

Take Beijing as an example, April and May are the most windy days, especially in April. At the same time, there are not only many windy days in spring, but also many. For example, in Inner Mongolia, the wind is stronger from March to May than at other times.

The wind is strongest in Grain Rain in spring. When is the wind strongest in spring? According to the gale data of each solar term, according to the national average, the solar term in Grain Rain is the biggest stroke season in a year, or the most prominent in the north. Several provinces in Northeast China, North China and Huanghuai, such as Inner Mongolia, Liaoning, Shandong and Henan, are basically the largest in Grain Rain.

In Beijing, it's a little different. The winds in Qingming and Grain Rain are relatively strong. But both Tomb-Sweeping Day and Grain Rain are in the solar terms from April to May. Generally speaking, it is windy at this time, and it is also the best time to fly a kite.

It's windy in winter, so why not fly kites? Then, it's windy in winter, so why not fly kites? According to meteorologists, the wind in spring has an upward trend, and the wind in winter has a downward trend. After beginning of spring, the surface temperature rises rapidly, but the altitude is still relatively cold, so the combination of upper cold and lower warm is easy to produce convection, and the updraft will easily send kites into the air. However, in winter, there are frequent cold air activities, and the wind is mostly blowing downward, so the kite naturally cannot go up.

Of course, on the other hand, due to the cold winter, people naturally lack the enthusiasm to fly kites in the cold.

When is the best time to fly a kite in a day? Although the wind is strong in spring, it won't blow all day. Usually, the wind force on sunny days is stronger than that on cloudy days, because the vertical turbulence exchange is more obvious on sunny days, and the wind force is strongest from noon to afternoon, because the momentum is downward. So what is this "downward momentum transfer"?

Generally speaking, in spring, the ground heats up quickly and enters the spring state first, but the high altitude still maintains the attribute of winter, so the wind at high altitude is relatively strong, and the convection around noon is relatively strong, and the high and low wind directions of the air will also be exchanged, and the high altitude wind will be transmitted down to the ground, resulting in an increase in the wind force on the ground.

It's like a person who can't run fast, holding a crossbow in his left hand and Liu Xiang in his right hand. Running hand in hand with him will naturally be fast. After the evening, the convection activity weakens, and the wind will obviously decrease, so there is a proverb-strong winds are afraid of sunset.

So it is the easiest time to fly a kite around noon in a day, but if you happen to be in the local area and the wind is too strong, it is best not to fly a kite at this time, because the kite may not come back.

Kites need a steady wind. For flying kites, the smoother the wind, the better, but this condition is not satisfied in many cases. Sometimes, due to the inconsistent wind speed or wind direction in the upper and lower air, there are obvious changes, which will lead to the kite not flying high even if it can take off smoothly, or rolling at high altitude. This is the occurrence of wind shear. If the unfortunate wind shear appears near the ground, the kite will not take off easily even if there is wind.

In a word, flying kites is a very popular leisure activity. People should try to choose a flat and empty place when flying kites. If the wind looks good, but they just can't let it go, then don't play, and fight another day. Of course, when flying a kite, you should pay attention to safety, control the kite string, don't cut people, and be careful not to be stabbed by the kite. If you are cut by the kite string, you must wrap it with gauze and seek medical attention in time.

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