"This had to be the coolest/scariest thing I've ever seen," Janae Copelin wrote on her Instagram page. "A farmer burning off his field and as we stopped so I could take a picture the wind whipped up this fire twister."
According to The Weather Channel, sights like this are more common than you might think:
Firewhirls turn and burn. They are rapidly spinning vortices that form when air superheated by an intense wildfire rises rapidly, consolidating low-level spin from winds converging into the fire like a spinning ice skater, pulling its arms inward.
The typical firewhirl can grow to about 100 feet tall, but is very narrow, on the order of a couple of feet wide.
Researchers in Australia documented the process of "pyro-tornadogenesis" for the first time after analyzing evidence collected during a wildfire in Canberra in January, 2003.