A fire whirl -- also commonly known as a fire devil, or, (in many cases erroneously), as a fire tornado, firenado, fire swirl, 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 combine to form whirling eddies of air. These eddies can contract into a tornado-like vortex that sucks in burning debris and combustible gases.

is there such a thing as a firenado?
yes