Spring thunder, meteorological term. Every spring, especially after dormancy, the obviously enhanced warm and humid air confronts fiercely with the unruly cold air, resulting in a strong vertical convection movement of the air. When moist warm air rises to a certain height, it will form high cumulonimbus clouds. The strong electric field in the cloud will make the positive and negative charges collide and discharge, thus causing sudden lightning.
Thunder only conforms to the meteorological laws in some parts of southern China. In spring, affected by the warm and humid airflow in the south, the air is humid and the solar radiation is strong. 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.