Sand wall
From Glossary of Meteorology
sand wall
The leading edge of a gust front that is filled with suspended sand particles as is often associated with thunderstorm winds over desert regions.
The sand wall is the leading edge of the haboob, and looks like a knobby, dun-colored wall of turbulent air.
See saltation, aerosol, airborne particulates, downburst.
See saltation, aerosol, airborne particulates, downburst.