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develops along a thunderstorm gust front

[Image: gustnado (55K)]
Photograph by: Doswell

This is a northward view of a gustnado, a tornado that develops on a thunderstorm gust front with marked across-front horizontal shear. Gustnadoes typically are weak and short-lived as tornadoes go, since they are not associated with an intense deeply rotating updraft. They are also nearly impossible to warn for, because of their seemingly random occurrence along the gust front.

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Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.