Thunderstorms are relatively common weather phenomena.
In one sense, you probably know what they are: loud, wet storms, sometimes furious, sometimes with bright flashes of lightning.
Thunderstorms grow when a convection cell (circulating warm and cooling, condensing air) in the atmosphere rises quickly as a result of intense heat. The air can rise miles high in a matter of minutes, which causes a great updraft.
A rain cloud develops rapidly with the cooling air condensing into water droplets or ice crystals until they become heavy enough for gravity to pull them back toward Earth.
Thunderstorms occur in warm weather when moist air rises very quickly and cools.