Home › Part 107 Practice Tests › Aviation Weather Questions › Question 6
A METAR reports 'FG' with visibility of 1/2 SM. What weather is present and why is that code used?
- A.Mist, because visibility is above 5/8 statute mile
- B.Fog, because visibility is below 5/8 statute mile
- C.Haze caused by dust in dry air
Correct answer
B. Fog, because visibility is below 5/8 statute mile
Why
FG is the code for fog when obscuration reduces visibility to less than 5/8 statute mile. When visibility is 5/8 mile or more, the same moisture-based obscuration is coded as BR for mist.
Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-006).