Will it snow and thunder in winter?

As we all know, lightning is a discharge phenomenon in thunderstorm clouds. The formation of thunderstorm clouds should meet certain conditions, that is, there should be enough water vapor in the air, the power to make wet air rise, and the air should be able to produce strong convection. Spring and summer are affected by the warm and humid airflow in the south, with humid air and strong solar radiation. The air near the ground is constantly heated up, and the upper cold air sinks, which is easy to form strong convection, so there are many thunderstorms and even hail.

In winter, controlled by the continental cold air mass, the air is cold and dry, the solar radiation is weak, and the air is not easy to form violent convection, so thunderstorms rarely occur. But sometimes the weather is warmer in winter, and the power of warm and humid air is stronger. When the cold air in the north occasionally goes south, the warm and humid air is forced to rise, and the convection intensifies, so-called "thunder into winter" phenomenon will occur. Meteorologists also say that the occurrence of thunderstorms does not depend 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. Thunder in winter is rare in China, but "thunderstorm" often occurs in Toronto in winter, so "thunderstorm in winter" is only a weather phenomenon, which has nothing to do with omen.

There is also a folk proverb "it thunders and snows in winter", which means that thunder in winter means that the air humidity is high and it is easy to form rain and snow; And "when it thunders in winter, ten cowsheds are nine empty", that is to say, when it thunders in winter, warm and humid air is very active, cold air is also very strong, and the weather is cold, even cows may freeze to death.