A thunderstorm is a rainstorm with both lightning and thunder. Thunderstorms begin in cumulus clouds. Winds shake the moist air and raindrops fall. In a rainstorm, lightning may streak across the sky. Thunder is the sound caused by lightning.
Air is heated instantly when light passes through it.
Lightning is a giant electric spark. Heather Sunshine shining through drops of rain makes the rainbow. Raindrops separate bright white sun light into bands of color, too. The water forms around a piece of dust. You can tell a lot about the weather yourself by just looking at clouds.