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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.
Myrtle Beach Tornadoes: July 6, 2001. During the late afternoon of July 6, 2001, two tornadoes occurred in portions of North Myrtle Beach and Myrtle Beach, South Carolina. A Special Marine Warning was issued for the coastal waters adjacent to Horry County at 3:38 pm. This warning was in effect due to large thunderstorms drifting south along the coastline.