A thunderstorm is a weather event characterized by heavy rain, strong winds, and loud claps of thunder. These storms form when warm, moist air rises and cools, creating clouds that can produce rain. The energy from the rising air can lead to the development of lightning, which is a bright flash of electricity that occurs during the storm. During a thunderstorm, you might see dark clouds and hear rumbling sounds in the distance. It's important to stay safe by seeking shelter indoors, as strong winds and lightning can be dangerous. After the storm passes, you may notice the air feels fresher and cooler.