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Dust storm. A dust storm (or sandstorm in some contexts) is a meteorological phenomenon. Such a storm is usually the result of convection currents created by intense heating of the ground. Note: The above text is excerpted from the Wikipedia article Dust storm, which has been released under the GNU Free Documentation License.
Sandstorms -- also called duststorms -- are caused by strong winds blowing over loose soil or sand, and picking up so much of that material that visibility is greatly reduced. The widespread abundance of loose sand in deserts makes them the most common locations for sandstorms to form. In desert regions at certain times of the year, sandstorms become more frequent because the strong heating of the air over the desert causes the lower atmosphere to become unstable. This instability mixes strong winds in the middle troposphere downward to the surface, producing stronger winds at the surface.