What does the Qingming North Wind portend?

The Qingming north wind indicates that it is easy to bring about rapid cooling, and there is little rain in the later period, which has a negative impact on crop harvest.

"Tomb-scraping soil in Qingming Festival" refers to the day of Tomb-Sweeping Day, and "tomb soil" refers to the fact that when people go to the tomb to pay homage to their ancestors in Tomb-Sweeping Day, they will add soil to the tomb, which means adding happiness and longevity. The word "scraping" here refers to windy weather, so the complete meaning of this sentence is: the strong wind in Tomb-Sweeping Day scraped away all the soil on the grave that day, indicating that it was windy.

There will be a strong wind in forty-five minutes. What I'm saying here is that it was windy in Tomb-Sweeping Day that day, so it indicates that there will be a long windy weather in the later period. When I say "forty-five" here, I mean forty-five days, which means one and a half months. This windy weather will blow intermittently for 45 days. It seems that there are more windy weather in the later period, which is not conducive to crop growth.

The windy days in Tomb-Sweeping Day can not only predict the rain and drought, but also predict the bumper harvest of food crops, and continue to analyze. Agricultural proverb 1: If the north wind blows tomorrow, there will be no harvest for the crops. At first, we analyzed that the north wind blew in Tomb-Sweeping Day on this day, and there was little rain in summer. This sentence further predicts that the Qingming north wind blows, the crops in the field are not harvested, and the food crops are not growing well.

It is said that there are more winds in spring, and the winds are more frequent, but most of them are cool. If on this day in Tomb-Sweeping Day, the wind blows away the soil on the grave, it means that the wind is very strong. This indicates that intermittent rainfall will continue in the next month or two. According to many agricultural proverbs handed down from our ancestors, combined with the gale situation in Tomb-Sweeping Day this day, we analyzed and predicted the future weather changes and grain harvest.

The cause of the wind:

Wind is a kind of air flow phenomenon on the earth, which is generally caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat the air and make it rise. This airflow is the wind.

When the gathered water vapor (cloud) forms water, its volume shrinks, and the surrounding water vapor comes to replenish it, forming wind. The wind on the earth is related to water sources. The expansion and contraction of water and steam produce wind. The wind blows from the ocean to the land, or the land blows to the ocean. In summer, when the ground temperature is high, the air and water vapor expand and rise, so the air space on the ground should be supplemented with air and water vapor heavier than the sea surface.