A gustnado is a specific type of short-lived, low-level rotating cloud that can form in a severe thunderstorm. The name is a portmanteau of `gust front tornado`, as gustnadoes form due to non-tornadic cyclonic features in the downdraft from the gust (outflow) front of a strong thunderstorm, especially one which has become outflow dominated. It h.....
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http://en.wikipedia.org/wiki/Gustnado
(from the article `tornado`) ...most commonly form beneath the flanking line of cumulus congestus clouds that frequently develop above a strong thunderstorm`s gust front (the ...
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http://www.britannica.com/eb/a-z/g/84
Gust front tornado. A small tornado, usually weak and short-lived, that occurs along the gust front of a thunderstorm. Often it is visible only as a debris cloud or dust whirl near the ground.
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http://www.timeanddate.com/weather/glossary.html
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