What is the thunder and hail in winter?

It thunders and hails in winter because the warm and humid airflow is particularly strong and the convection is particularly strong.

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. However, sometimes the weather is warmer in winter, and the warm and humid airflow is more severe. When there is occasional strong cold air going south in the north, warm and humid air is forced to rise and convection is intensified. Thundershowers can also be formed, and the warm and humid airflow is particularly strong, and the convection is particularly strong. It can also form hail, causing the so-called thunder and winter phenomenon.

In winter, the temperature of high-altitude clouds is generally below zero degrees Celsius, and the water vapor in the clouds will condense into snow. Because the ground temperature is not high, the snowflakes falling from the sky will not melt, resulting in thunderstorms at the same time. In fact, the high-altitude airflow is constantly moving, but their flow directions are inconsistent and their velocity is different.

Coupled with the ups and downs of space, these friction clouds all carry different charges. As we all know, the same kind of charges are bound to repel each other, so the two ends of the cloud generally accumulate negative charges and positive charges respectively. The charge on the cloud depends on the thickness of the cloud and the speed of the air around the airflow. Once the charge on the cloud reaches the limit, the surrounding air will discharge, causing the expanding air to make deafening noise.

The principle of thunder:

The principle of thunder is that when it rains, some clouds in the sky are positive and some are negative. When two kinds of clouds meet, they will emit lightning, and at the same time release a lot of heat, which will make the surrounding air expand. Instantly heated and expanded air will push the surrounding air and produce strong explosion vibration, which is thunder.

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 sometimes when the temperature is high in winter, it will form thunderstorm clouds, leading to lightning and rain and snow. Convection is particularly strong, and it can also form hail, which will produce the weather phenomenon of "thunder in winter". Knowing these reasons, it is not surprising that it thunders in winter.