How is severe turbulence depicted on a GFA?

Severe turbulence on a Graphical Flight Information (GFA) is depicted by a hatched area surrounded by a solid line. This symbol allows pilots to quickly identify regions of significant turbulence that may affect their flight. The use of a hatched area indicates instability, while the solid line emphasizes the boundary of that area, indicating that pilots should exercise caution when flying through or near it. The clarity provided by this method helps ensure that pilots can make informed decisions regarding their flight path and altitude adjustments to maintain safety during turbulent conditions.

The other options do not represent severe turbulence on a GFA. A solid area with a distinctive color may refer to other weather phenomena, cross-hatching typically indicates different conditions, and an area marked with an X is not a standard representation for turbulence on a GFA. This clear distinction in symbols is crucial for effective navigation and safety in aviation.