Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PHENOMENA > TORNADOES

Definition:
A small mass of air (whirlwind) that spins rapidly about an almost
vertical axis and forms a funnel cloud that contacts the ground; appears
as a pendant from a cumulonimbus cloud and is potentially the most
destructive of all weather systems.


Reference:
Glossary of Weather and Climate, American Meteorological Society, 1996.