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en.wikipedia.org/wiki/Fire_whirl

A fire whirl – also commonly known as a fire devil, or, (in many cases) erroneously, as a fire tornado, firenado, or fire twister – is a whirlwind induced by a fire and often made up of flame or ash. They usually start with a whirl of wind or smoke. Fire whirls may occur when intense rising heat and turbulent wind conditions ... usually classifiable as tornadoes as the vortex in most cases does not extend ...

weather.com/storms/tornado/news/fire-tornado-firewhirl-photos-20130814

May 15, 2014 ... The inferno spun off smoke twisters, and a fire tornado formed. ... They are rapidly spinning vortices that form when air superheated by an ...

news.nationalgeographic.com/news/2010/09/photogalleries/100903-fire-tornadoes-pictures-whirls-vortex-firenadoes-devils-science-weather

Sep 5, 2010 ... Recent "firenadoes" in Brazil and Hawaii aren't rare, just rarely reported, an expert says: Large-scale versions occur once a year in the U.S..

www.ask.com/youtube?q=How+Do+Fire+Tornadoes+Form&v=vJVertGZJUM
Sep 8, 2010 ... Fire tornadoes are rare in nature, but when they do start spinning ... an explanation on how and why they occur from a fire protection expert.

thevane.gawker.com/how-do-firenadoes-form-1576709664

May 15, 2014 ... They are tornado-like swirls of smoke and fire that form in intense wildfires. Despite their popular name, firenadoes more similar to dust devils ...

www.livescience.com/45676-what-is-a-firenado.html

May 16, 2014 ... What is a fire tornado, and how dangerous are they? ... As hot air rises from the ground, it forms vertical columns, or "chimneys," until it becomes ...

earthscience.stackexchange.com/questions/3189/how-does-a-fire-tornado-form

Jan 3, 2015 ... They form due to strong convective forces, coriolis effects, local wind and weather , and local topography. The fire effectively creates an intense ...

www.reference.com/science/fire-tornado-form-744c90e9200823fd

Fire tornadoes form when combustible gases ignite in windy conditions. According to the Mother Nature Network, most fire tornadoes spawn from wildfires.

www.scholastic.com/browse/article.jsp?id=3754820

Last week, a wildfire and a tornado in Hawaii combined to form what's known as a fire tornado. A week earlier, there was another fire tornado in Brazil.