What does DRDU stand for in weather observations?

DRDU stands for "Low drifting dust." This term is used in weather observations to describe a phenomenon where dust particles are picked up by the wind and carried at low altitudes, typically near the surface. When reporting weather conditions, it is important to denote such phenomena clearly, as they can significantly affect visibility and air quality.

The observation of low drifting dust is particularly relevant in areas prone to arid conditions or following disturbances that may displace loose soil. Observers need to use specific notations like DRDU to accurately convey this information to meteorologists and pilots, as it signifies a specific kind of dust occurrence that differs from other related phenomena, such as blowing sand, which would be indicated by a different code.