Wind is a flowing atmosphere, and the atmosphere is what we commonly call air. The wind comes from the north, the south and other directions. Due to the inconsistent geographical attributes in all aspects, the winds in different producing areas have their diverse characteristics. There are cold air and hot air; There is dry wind and wet wind. The wind blowing from the desert carries dust; The wind from the ocean contains more water vapor. So in different winds, we have different feelings and can see different sky scenes. Furthermore, if two different winds meet, it is easy to conflict, and then you can see the sudden change of the weather. Wind is the most easily perceived phenomenon, so there are many proverbs about it. * The east wind is the mother of rain. (Hunan) * Dongfeng is a genius, and it will be cloudy if it doesn't go down. (Zaoyang, Hubei) * The east wind is all around, so I'm afraid it will make trouble. (Nanjing, Jiangsu) * The east wind blows hard and it rains heavily. (Shanghai) * East wind is urgent, prepare the hat. (Hubei) * East wind is urgent, prepare the hat, Yun Qi wind is urgent. The more urgent, the heavier the rain. The wind in Tian Xing means that it doesn't necessarily rain when the east wind is strong, but it will be terrible when the east wind is strong. Since the east wind is very small, such air flow must come from a very close place, perhaps a local air flow. All its attributes must be consistent with the local environment, so it is rare for the weather to get worse. However, if the easterly wind is strong, it means that the easterly wind in front of the cyclone is an airflow from a distance, and there will be a gap-the front of the airflow is moving locally, so the weather will change. * Southeast wind, dry and loose. (Jiangyin, Jiangsu) * The south wind flooded in May, and the south wind dried up in June. (Zhejiang, Guangdong) * South wind drive hose in May; In June, the south wind is starry at night. (Guangdong) * South spring wind, rain drums; The south wind in summer is empty. (Zhongxiang, Wuxi, Jiangsu, Hubei) * The southwest wind is sunny in June. (Wuxi, Jiangsu) * The south wind starts in June, with ten pu and nine pu. (Hubei) "Tianjiaojie" means sunny weather; "Rush" means mountain rush, and "ten rushes and nine rushes" means mountain rush was killed in nine cases, and the drought was very serious. This is a popular summer weather proverb in southeast coastal provinces. The southeast wind comes from the ocean. Why did you do it again? We know that the decline of rain, on the one hand, of course, there must be a substance that condenses rain-water vapor; At the same time, it is necessary to have the conditions to turn these water vapor into clouds and rain. This situation, in the summer in the southeast plain, depends on the convection of heat or the front activity between two airflow from different directions. Thermal convection occurs because the ground is extremely hot, and the air in the ground layer rises upward because of the principle of thermal expansion and contraction, bringing the water vapor from the ground to the upper air for cooling, resulting in clouds and rain. But if the wind is too strong and the air flow on the ground is too fast, it is impossible to concentrate on the ground and receive strong heat, and it is impossible to make the water vapor on the ground rise. Also, in the pure southeast wind, due to the high altitude sinking of its birthplace, there is often an inverse ratio between high altitude and low altitude warming; In this way, the air on the ground is difficult to rise. Therefore, although there is a lot of water vapor in the southeast wind, it is still impossible to cause rainfall. There is no sex and rain in summer, and the natural weather is very hot. Secondly, speaking of positive activities. The front is the conflict area of two different airflow. One airflow is cold and heavy, and the other airflow is light and warm. When these two air streams meet, the light warm air stream only rises and does not fall. As a result, the water vapor on the ground was carried to high altitude, causing clouds and rain. At present, there is only southeast wind on the ground, which means that there is no other northerly airflow colliding with it to form a front, so the water vapor can't rise and clouds and rain appear. * Northeast wind, too much rain. (On the Wind in Tian Xing) The northeast wind is the air flow originating from the northern ocean surface or passing through a long-distance ocean surface, which naturally contains less water vapor than the southeast wind; However, because it is a cold air flow, its lower part touches the relatively hot ocean surface or land surface in the south, making its upper part cold and its lower part warm, resulting in convection. As a result, the water vapor on the ground was brought to the sky and had sex. In addition, the front of the cyclone must be where the northeast wind moves, so there is front precipitation. According to the statistical results, in the case of pure northeast wind, the probability of rain is only 26% in winter and only 1 1% in summer, which means that the probability of no rain is 74% and 89%. If it is the northeast wind before the cyclone, that is, the northeast wind area with active front, the probability of rain will exceed that of sunny days. Therefore, the proverb' northeast wind, too much rain' is not necessarily completely reliable. * The spring breeze blows the east wind, and the grandfathers get wet. (Changzhou, Jiangsu) * In spring, the east wind is blowing and the rain is gurgling. These two proverbs mean that the east wind blows in spring, which is a precursor to bad weather. This is because, on the one hand, the ground will get warmer in spring. On the other hand, the warm air is gradually active, the continental pressure is gradually decreasing, and the anticyclone moves eastward into the sea. An easterly wind will appear at the tail of the anticyclone. These easterly winds flow to warmer land, leading to the phenomenon that the upper part is warm and the lower part is cold. At this time, the air layer is unstable and prone to upward convection, so it is very likely to produce precipitation. * East wind and rain for three days a day; On the third day, the east wind disappeared. (Guixian, Guangxi) * East wind rains for three days a day; Three days of east wind and nine days of eyes. (Wuchang, Hubei) * East wind and rain for three days a day; Dongfeng has no rice for three days. "Cooking without rice" in Guangxi is the result of drought and lack of rain. The cyclone moved from west to east, with the east wind ahead, but it soon blew up, and turned to another wind direction because of the advance of the cyclone. So the east wind blows for only one day, or less than one day, and the wind direction changes, indicating that there is a cyclone coming, so it may rain for three days. If the east wind blows for three days without rest, it means that there is no cyclone approaching in the west, so there is no rain in this place.