Thunderstorm
Thunderstorms form when warm air rises and cool air sinks. Small bits like ice and water form in the clouds during a thunderstorm and crash together making lightning. When the lightning strikes it makes heat in the air causing an increase in air pressure, which forces a shock wave to move away from the lightning. The sound of the wave is called thunder. A thunderstorm, also known as an electrical storm, a lightning storm, or a thundershower, is a type of storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder. Thunderstorms are usually accompanied by strong winds, heavy rain and sometimes snow, sleet, hail, or no precipitation at all.