Which GFA symbol would you use to indicate significant turbulence?

The appropriate symbol to indicate significant turbulence on a Graphical Forecast for Aviation (GFA) is the one that represents turbulence, particularly in the context of clear air turbulence (CAT) or mechanical turbulence. Turbulence can occur in various forms, which may not always be associated with visible weather phenomena. The symbol specifically designed to convey areas of turbulence helps pilots to anticipate and manage in-flight conditions effectively, enhancing safety and comfort.

In contrast, while cumulonimbus clouds typically indicate areas of severe turbulence due to their vertical development and association with thunderstorms, they do not exclusively define all significant turbulence conditions. Severe thunderstorm warnings focus on areas where severe thunderstorms might be occurring but do not specifically detail turbulence. Wind shear warnings highlight changes in wind speed or direction that may lead to turbulence, but they are more focused on the abrupt changes in airflow rather than ongoing turbulence itself.