Definitions for "Blowing dust"
Keywords:  dust, mile, bldu, visibility, metar
Dust picked up locally from the surface of the earth and blown about in clouds or sheets, reducing the reported horizontal visibility to less than 7 statute miles.
dust that is raised by the wind to moderate heights above the ground to a degree that horizontal visibility decreases to less than seven miles.
Wind-driven dust that significantly reduces surface visibility to less than 7 miles.