a transient storm
of lightning and thunder
, usually with rain and gusty winds, sometimes with hail or snow, produced by cumulonimbus clouds.
A thunderstorm, also known as an electrical storm, a lightning storm, or a
thundershower, is a type of storm characterized by the presence of lightning and
Basic information about severe thunderstorms, from the NOAA National Severe
A map showing the average number of thunderstorm
days each year in the U.S. (2010)
In the spring and summer months, thunderstorms
seem to occur like clockwork. Thunderstorms
can occur at all times of the year, and at all hours of the day (not just afternoons or evening... More »
Yes, despite their small size, all thunderstorms are dangerous. Every
thunderstorm produces lightning, which kills more people each year than
The action of warm air rising and cold air sinking (convection) plays a key role in
the formation of severe thunderstorms. If the warm surface air is forced to rise, ...
Jul 14, 2015 ... All thunderstorms are dangerous. Every thunderstorm produces lightning. While
lightning fatalities have decreased over the past 30 years, ...
Thunderstorm safety tips from the American Red Cross. Every thunderstorm
produces lightning, which kills more people each year than tornadoes or
Severe Thunderstorm Watch—Severe thunderstorms are possible in and near
the watch area. Stay informed and be ready to act if a severe thunderstorm.