At what speed will the movement of synoptic features on the GFA be indicated?

The correct speed indicating the movement of synoptic features on the GFA (Graphical Area Forecast) is 5 knots or more. This threshold is important because it establishes a standard for recognizing significant meteorological changes depicted in forecasts. When synoptic features, such as fronts or low-pressure systems, are moving at this speed or faster, they are considered to have a meaningful impact on weather conditions that pilots need to be aware of for flight planning and safety.

Movement below this threshold may not indicate significant changes and might not warrant the same level of attention from pilots, as slower features can linger and their effects may be less pronounced. Thus, 5 knots serves as a practical benchmark for pilots to monitor and factor into their navigation and decision-making processes during flight operations.