What aspect of visibility is addressed in a TAF?

The correct answer emphasizes that a Terminal Aerodrome Forecast (TAF) forecasts changes to visibility associated with different weather conditions that may be expected over the forecast period. TAFs provide an overall outlook of potential weather phenomena, such as fog, precipitation, or thunderstorms, which can significantly impact visibility. By detailing anticipated weather changes, TAFs help pilots anticipate visibility conditions they may encounter during their flight operations.

The focus on predicting how visibility may vary due to specific weather types is crucial for flight planning and in-flight decision-making. This ensures that flight crews are aware of potential visibility reductions that could occur as they approach or depart from an airport, thus enhancing safety.

In contrast, the other options consider aspects that are not covered by TAFs. For instance, while flight visibility is essential, TAFs do not specify minimum acceptable flight visibility directly; they rather convey expected weather conditions that could affect visibility. Similarly, TAFs do not provide information on visibility aids at an airport or list visibility for multiple altitudes, as their primary function is to forecast general weather elements rather than specific operational details about visibility aids or altitudinal variances.