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How is lightning formed?
The simultaneous occurrence of lightning is a discharge phenomenon between clouds with different charges or between clouds and the earth. When the distance between clouds with different charges is reduced to a certain distance due to movement, the strong potential difference between positive and negative charges will break through the air and cause instantaneous discharge. The discharge spark produced during discharge is the lightning we see, and the sound produced during discharge is thunder.

Similarly, when charged clouds move, induced charges will be generated at the corresponding places on the ground. If the distance between the cloud and the ground or a tall object on the ground is small, the air between the cloud and the object is decomposed and lightning is generated by instantaneous discharge. We see lightning first and then hear thunder, so the speed of light is much faster than the speed of sound, so we see lightning first and then hear thunder.

Extended data:

Hot 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.

1, 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.

2. 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.

3. There is no wind or the wind is small, 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).