What are the specific conditions that need to be paid attention to when looking at the weather?

The same wind does not necessarily lead to the same weather, it depends on the specific situation.

First of all, it depends on the season. In summer, warm air flow is stronger than cold air flow. As soon as the southeast wind blows, the cloud and rain belt in front pushes north. At this time, under the control of a single heating flow, the air in the middle and lower reaches of the Yangtze River lacks the conditions for upward movement, so there is a saying that "the east wind rains three seasons a year, and the east wind is sunny in midsummer". If the Pacific subtropical high is controlled stably, the summer monsoon will prevail. Although the summer monsoon comes from the southeast ocean, the air flow under the control of high pressure is stable, and the weather is sunny and hot with little rain, so it is "southeast wind, dry". If the northwest wind blows in summer, it indicates rain, so there is a proverb that "winter is fine and summer rain" and "the north wind gives birth to summer rain".

Cold air is stronger than warm air in winter, and northwest wind often pushes the frontal cloud and rain belt to the southern ocean. At this time, under the control of a single cold air, the weather in the middle and lower reaches of the Yangtze River is fine, just as the proverb says, "the northwest fields are dry after autumn" and "the northwest fields are dry after spring"; It will clear up in winter and northwest China. "If the southeast wind blows at this time, but the duration is not long, this is' the south wind blows to the end, and the north wind returns', which indicates that the cloud and rain belt ahead will affect the local area and the sky will turn cloudy." Ask about the distance of the rain, but look at the southeast wind. "

Secondly, it depends on the wind speed. As the saying goes, "the east wind rains, but it is too elegant." Only when the east wind roars day and night can it be: the wind is crazy and the rain is sudden; Only when the southeast wind is tight can it rain fast and hard. In dry days in winter, it will take two or three days for the easterly wind to rain; If the wind reaches five or six, it may rain for a day or two. In the rainy period of early summer, it will rain as long as the southeast wind blows for a while.

In addition, "the wind is the first rain, and the wind is crazy and the rain is closed." Before a shower, it is often the wind that blows first and then the rain falls. When the rain stops, the wind increases first, and then the rain stops, that is, "the strong wind overwhelms the fierce rain." This phenomenon occurs under cumulonimbus clouds. Because the cumulonimbus cloud is approaching the rain area, there is wind first, then rain. When the wind and rain are heavy, the rain area passes quickly.

Third, we should pay attention to locality. We must distinguish between "Zhen Feng" and "false wind". In general, wind direction and wind speed have different diurnal variation laws in different places. This normal daily variation law can't reflect the influence of weather system, so people call it "false wind". Only when the wind direction is stable in a certain direction and the wind is gradually increasing, can it be the "Zhen Feng" that can predict the weather change. Generally, "Zhen Feng" should be scraped from morning till night, and scraped from night to midnight; Especially the night wind, it is more conducive to forecasting the sunny weather. As for the local mountain valley wind, it also belongs to the "false wind" and cannot be used to predict the weather turning point.

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