SANTA BARBARA COUNTY, CA - Incredible video of a fast-moving 'firenado' was caught on video Thursday night in the Sherpa wildfire in southern California.
The "fire devil," as it's also called, happens when wildfires break out on a day that the atmosphere is unstable, with pockets of varying temperatures.
When the blazing 2,000 degree fire meets a pocket of cold air above it, the fire shoots upward, swirling into a whirlwind of fire as it battles the cold air.
Firenadoes can soar up to ten stories tall and ten feet wide, spewing out flaming embers, causing the wildfire to widen.
100 homes in California remain evacuated, and several roads closed, as fire crews continue to battle the Sherpa wildfire.
Fire crews are working around the clock to contain the out-of-control blaze.
So far, the fire has torched about 4,000 acres, and it continues to grow, fueled by high winds.
The cause of the fire is under investigation.
Live Science reports that one of the worst firenadoes on record happened in 1871 in Peshtigo, Wisconsin.
At least 1,500 people were killed when a 100 mile-per-hour wildfire swept through town, igniting several lumberyards.
The resulting firenados then picked up and threw houses, buildings, and even train cars into the air.