According to the different terrain and meteorological conditions, lightning can be generally divided into three types: hot lightning, front lightning (hot front lightning and cold front lightning) and terrain lightning.
Water vapor in the atmosphere is the internal cause of the formation of Lei Yun; The formation of Lei Yun is also related to natural topography and meteorological conditions.
Thermal lightning is a kind of lightning that often occurs in summer afternoon, often accompanied by heavy rain or hail. Thermal lightning forms quickly and lasts for a short time, 1 ~ 2 hours; The length of the minefield does not exceed 200 ~ 300 kilometers, and the width does not exceed dozens of kilometers. The formation of thermal lightning must meet the following conditions.
The air is very humid and the water vapor in the air is almost saturated, which is a necessary factor for the formation of thermal lightning.
In sunny summer and scorching sun, the ground is exposed for a long time, and the temperature of humid air near the ground rises rapidly, which makes people feel sultry, which is a necessary condition for the formation of thermal lightning.
There is no wind or breeze, resulting in uneven air humidity and temperature. The reason why there is no wind or light wind may be because the airflow here has not changed much, or it may be because of the terrain (such as mountain basins).