What does October thunder portend?

Thunder in the lunar calendar 10 indicates that the weather will be bad. Thundering in winter means that the air humidity is high and it is easy to form rain and snow, so there is a saying that it thunders and snows in winter.

In fact, lightning is a discharge phenomenon in thunderstorm clouds. Thunderstorm clouds generally have two conditions, sufficient water vapor and strong convection. In winter, because the air is cold and dry, the solar radiation is weak, and convection is not easy to form in the air, so lightning is rare.

But in winter, sometimes the temperature is high and the warm and humid air flow is strong. When there is occasional strong cold air going south in the north, the warm and humid air is forced to rise, and the convection intensifies, forming thunderstorm clouds, producing lightning, rain and snow weather, which is particularly strong, and can also form hail, which will produce the weather phenomenon of "thunder in winter".

Extended data:

The ancients called thunder in solar terms spring thunder, so the thunder that appeared in the first month was called "winter thunder". There is a saying that "winter thunder snows", which means that winter thunder is a harbinger of snowstorm. When it snows, thunder means "it thunders and snows".

There are also folk proverbs about winter thunder, such as "thunder and snow in the first month, rain in February, fewer seedlings in March, and seedling festival in April" and "thunder and drought in the first month 180 days".