blowing sand"Sand particles picked up from the surface of the earth by the wind, reducing the horizontal visibility to less than 11 km (about 7 statute miles).
BLOWING SAND Sand that is raised by the wind to heights of six feet or greater. It is reported as "BLSA" in an observation and on the METAR.
blowing sand—A type of lithometeor composed of sand picked up locally from the surface and blown about in clouds or sheets.
According to the National Weather Service, some of the obstructions to visibility include blowing and widespread dust, fog (including freezing fog and patchy fog) haze, mist, sand and blowing sand smoke, blowing spray, and volcanic ash.
Blowing Sand: Sand pick up and blown about by the wind.
Blowing Snow:Snow lifted to 6 feet or more above the surface of the ground.
Blowing Spray: Water pick up and blown about by the wind.
 See also: Surface, Observation, Horizon, Air, Meteor
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