A funnel cloud (generally the cause of a twister or tornado) is a funnel-shaped cloud of condensed water droplets, associated with a rotating column of wind and extending from the base of a cloud (usually a cumulonimbus or towering cumulus cloud) but not reaching the ground or a water surface. A funnel cloud is usually visible as a cone-shaped or ...
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http://en.wikipedia.org/wiki/Funnel_cloud
A rotating, cone-shaped column of air extending downward from the base of a thunderstorm. When it reaches the ground it is called a tornado.
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http://ggweather.com/glossary.htm
(from the article `tornado`) A tornado is often made visible by a distinctive funnel-shaped cloud. Commonly called the condensation funnel, the funnel cloud is a tapered column ...
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http://www.britannica.com/eb/a-z/f/71
A rotating, cone-shaped column of air extending downward from the base of a thunderstorm but not touching the ground. When it reaches the ground it is called a tornado.
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http://www.encyclo.co.uk/local/22268
A rotating column of cloud descending from the base of a large cumulus or cumulonimbus but which does not reach the surface.
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http://www.metcheck.com/OTHER/glossary.asp
A tornado which is beginning its descent from the base of a cumulonimbus cloud. This severe weather event may or may not reach the ground surface.
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http://www.physicalgeography.net/physgeoglos/f.html
A rotating, funnel-shaped cloud extending below the base of a thunderstorm. When it reaches the ground, it is called a tornado.
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http://www.stormfax.com/wxwords.htm
A rotating, cone-shaped column of air extending downward from the base of a thunderstorm but not touching the ground. When it reaches the ground it is called a tornado
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http://www.timeanddate.com/weather/glossary.html
A rapidly rotating column of air extending from a cumulonimbus cloud with a circulation that does not reach the ground. once a funnel cloud reaches the ground it is then called a tornado.
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https://www.encyclo.co.uk/local/22280
a rapidly rotating funnel-shaped cloud extending downward from the base of a cumulonimbus cloud, which, if it touches the surface of the earth, is a tornado or waterspout. Also called
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https://www.infoplease.com/dictionary/funnel-cloud
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