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What do the METAR codes 'FU' and 'DU' indicate as obscurations?
- A.Freezing rain and drizzle
- B.Smoke and dust
- C.Funnel clouds and dust devils only
Correct answer
B. Smoke and dust
Why
FU is smoke and DU is dust suspended in the air. Both can cut visibility sharply downwind of fires, industrial areas, or dry, windy terrain.
Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-076).