On a GFA, what does an area surrounded by a dashed orange line represent?

An area surrounded by a dashed orange line on a Graphical Area Forecast (GFA) indicates obstructions to vision that are not related to precipitation. This typically includes conditions such as fog, haze, and smoke, which can significantly reduce visibility for pilots. The dashed orange line serves as a visual cue to alert pilots about these areas, helping them make informed decisions regarding flight safety.

This information is critical for pilots as it aids in navigation and enhances situational awareness, especially in low-visibility conditions. Understanding the significance of such markings on a GFA is essential for flight planning and operational safety.