Nat Geo has a discussion and photos of Firetornados:
"...Also known as fire whirls, fire devils, or even firenados, fire tornadoes form when high heat and turbulent winds together spur whirling eddies of air, mechanical engineer Jason Forthofer told National Geographic News in September.
These eddies can tighten into a tornado-like structure that sucks in burning debris and flammable gases, said Forthofer, of the U.S. Forest Service's Missoula Fire Sciences Laboratory in Montana..."
more photos HERE. including this one in a California fire Photograph by David McNew, Getty Images
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