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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 which descends from a thunderstorm to the ground. No other weather phenomenon can match the fury and destructive power of tornadoes. Tornadoes can be strong enough to destroy large buildings, leaving only the bare concrete foundation.