Drifting snow
From Glossary of Meteorology
drifting snow
Snow raised from the surface of the earth by the wind to a height of less than 6 ft above the surface.
In aviation weather observations, drifting snow is not regarded as an obstruction to vision because it does not restrict horizontal visibility at 6 ft or more above the surface. When snow is raised 6 ft or more above the surface, it is classified as blowing snow.
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