This is from a training burn the Ferndale Volunteer Fire Department did this month. I was driving the water tender during the drill, and after the interior training was done the fire was allowed to spread. I got back from the final water run so I had some time to start taking photos. I walked around to the back of the property where the outbuilding was burning and saw in the middle of the inferno a fire tornado forming.
It whirled for about a minute and was pretty cool to watch. It was one time I wished I had a DSLR with video built in.