To describe fog as partial, what descriptor code will be used in METAR?

To describe fog as partial, what descriptor code will be used in METAR?

• A. FG
• B. PR
• C. MIFG
• D. BR

Answer: (C)

In METAR, how fog is reported includes a way to show its extent. Fog itself is indicated by FG, but when it’s not covering the area completely and is only partial, a prefix modifier is added to the phenomenon. The MI prefix means shallow or partial obscuration, so combining it with FG gives MIFG, which communicates that fog is present but not uniform across the station area. The other options describe different states (mist, or simply fog without indicating partial coverage), so they don’t convey the partial fog condition.

In METAR, how fog is reported includes a way to show its extent. Fog itself is indicated by FG, but when it’s not covering the area completely and is only partial, a prefix modifier is added to the phenomenon. The MI prefix means shallow or partial obscuration, so combining it with FG gives MIFG, which communicates that fog is present but not uniform across the station area. The other options describe different states (mist, or simply fog without indicating partial coverage), so they don’t convey the partial fog condition.