Generally speaking, the weather of thunder appears behind the shock pad, which is normal before the autumnal equinox. Before and after the "earthquake", the occasional thunder is due to the increase of earth humidity, which leads to the rise of hot air near the ground or the strong and frequent activity of hot and humid air in the north. Judging from the natural phenological process in various parts of China, due to the large span between north and south, the time when spring thunder begins to ring is different in the morning and evening.
In the north, occasionally strong cold air goes south, warm and humid air is forced to rise, and convection intensifies, which will lead to thunderstorms and the so-called "thunder into winter" phenomenon. The occurrence of thunderstorm depends not on the temperature itself, but on the upper and lower distribution of temperature. In other words, although the temperature is not high in winter, if the temperature difference between the upper and lower reaches a certain value, strong convection can also be formed, resulting in thunderstorms.
climate change
According to the ancient book Li Ji in the Western Han Dynasty, in the Book of Changes, Jing belongs to the divination of "shock" and the divination is "thunder". So thunder is associated with thunder, and the first thunder in the whole spring rings around it. Ray represents yang. Accurately speaking, when the spring thunder rings, the earth is the real yang.
It doesn't mean that it must thunder that day, or a day or two before and after the sting. As long as the time of thunder is close to stinging, it will be considered as "thunder stinging". Thunder stings very aptly, which accords with the climate law of 24 solar terms. This is a good phenomenon and a good year. Therefore, as the saying goes, "Much thunder and little rain, autumn valley is like mud", which means it will.