A thunderstorm, also called an electrical
storm or lightning storm, is a form of weather characterized by the presence of
lightning and its attendant
thunder produced from a
cumulonimbus cloud. The lightning is caused by an electrical charge that builds up inside the storm due to the movement of water droplets or crystals carried by the wind. Thunderstorms are usually accompanied by heavy rainfall (heavy downpours), strong winds,
hail, and sometimes
tornadoes. During winter months, snowfall occasionally takes place in a thunderstorm, an occurrence sometimes termed
thundersnow.
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