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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A thunderstorm which produces
tornadoes , hail 0.75 inches or more in diameter, or winds of 50 knots (58 mph) or more. Structural wind damage may imply the occurrence of a severe thunderstorm. See
approaching (severe).
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