What does the abbreviation "FG" indicate in a TAF?

The abbreviation "FG" in a Terminal Aerodrome Forecast (TAF) is used to indicate "Fog." This meteorological term is commonly encountered in aviation meteorology, as fog can significantly impact visibility and, consequently, flight operations. When the TAF includes "FG," it is informing pilots and flight planners that conditions are expected to be foggy, characterized by reduced visibility typically less than a mile.

Understanding this term is crucial for aviation safety, as foggy conditions can lead to challenges during takeoff, landing, and navigation. While the other options mention related meteorological concepts, none represent the definition of "FG" within the context of TAFs, making "Fog" the accurate interpretation.