Hailstones form in thunder clouds. If it is very cold, rain freezes. Then sleet may fall. 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.