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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.
Although most people think of tornadoes as the violent rotating columns of air on land, tornadoes can also occur on water. A waterspout is a type of tornado that forms over water. These tornadoes are usually weak, but can cause damage to boats and recreational vehicles.ost all of the large hail and extremely violent tornadoes are as a result of a supercell thunderstorm. These storms often feature wall clouds and mammatus clouds. While a dust devil is not a tornado in the strictest sense of the term, it is a type of vortex.