Have you ever seen a dust devil?

Most haven't witnessed this rare phenomenon that happens when the ground heats up rapidly. Also called a sand devil, it is a spinning updraft that usually forms on hot sunny days, when air close to the ground gets toasty. Normally harmless, a vortex results when this stretch of hot air rises rapidly into a small spinning column and cool air gusts down to replace it, swirling dust, dirt and sand in the process.

This one was captured on video during a controlled 150-acre burn at a Denver national wildlife reserve.