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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.
Sand Dropseed. Sand Dropseed is a warm season, perennial bunch grass that grows to a height of 1 to 2 1/2 feet. Growth starts in mid-spring and plants are mature by mid summer. It is a prolific seed producer and has high drought tolerance, allowing it to take over thin stands of alfalfa or other less greedy grasses.