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What is the difference between the METAR codes 'BR' and 'FG'?
- A.BR is blowing rain and FG is freezing drizzle
- B.BR occurs only at night and FG occurs only in the morning
- C.BR is mist with visibility at least 5/8 SM, while FG is fog with visibility below 5/8 SM
Correct answer
C. BR is mist with visibility at least 5/8 SM, while FG is fog with visibility below 5/8 SM
Why
Both codes describe moisture droplets suspended near the ground, but the visibility threshold separates them. BR is used at 5/8 statute mile or greater and FG is used below that value.
Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-007).