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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.
Tornado-A violently rotating column of air touching the ground, usually attached to the base of a thunderstorm. Tornadoes are natures most violent storms. Spawned from powerful thunderstorms, tornadoes can cause fatalities and devastate a neighborhood in seconds. Winds of a tornado may reach 300 miles per hour. Damage paths can be in excess of one mile wide and 50 miles long. Strong downburst (straight-line) winds may also occur due to the same thunderstom.