10 Bizarre-Looking Tricks of the Weather
A "Fire Whirl". The strong temperature gradient created by wildfires and the cooler air surrounding it can create a vortex---and, if the conditions are just right, the fire can travel upward forming a fire tornado which can extend hundreds of feet into the air. Text: Emily Anthes. Image: US Fish and Wildlife Service.
7 (More!) Phenomenal Wonders of the Natural World - WebEcoist
NATURAL:Fire Whirls, also known as fire devils ot toronadoea appear in or around raging fires when the right combination of climactic conditions are present. They have been known to be 1 mile high and gave speeds of over 100mph and last 20 minutes or more