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Confidence votes 95.7K. A sand tornado is not truly a tornado. It is a phenomenon called a dust devil. Dust devils are whirlwinds that form when a layer of hot air forms just above the ground and rises in a relatively small, rotating column, picking up up dust or sand as it does so. Dust devils are rarely strong enough to cause damage, and are much weaker than tornadoes.
A tornado is a violently rotating column of air extending from the base of a thunderstorm to the ground, often made visible by a funnel cloud. The formation of tornadoes is â¦ complicated. First, a condition called wind shear, in which the speed or direction of the wind changes with altitude.