Spring and summer season, due to the impact of warm and humidity in the south, the air is humid, and the sun radiation is strong, and the air is constantly improving, and the upper cold air is sinking, which is easy to form a strong up and down convection, which is easy to generate thunderstorm clouds. Thunderstorm weather, even hail.
In winter, due to the control of the mainland cold air group, the air is cold and dry, and the solar radiation is weak, the air is not easy to form a strong upper convection, so it is difficult to form thunderstorm cloud, which is difficult to produce thunderstorms, not to say hail.
However, during a certain period of time in the winter, the warm and humid air force is strong and the weather is warm (the temperature is often at 0 ° C), and the north has a strong cold air in the south, and the air is cold and air meets, weight Lighter warm and humid air is violently lifted, resulting in unstable atmospheric structure, intensifies the convection of the upper and down, which is likely to form a weather phenomenon of thunderstorm or Rayshi. When the warm and humidity flow is particularly strong, it is possible to form hail when the convection of air is very strong.
