ForeFlight provides General Aviation Forecasts, or GAFOR, in an interactive map layer to help pilots flying in Europe better assess upcoming weather and prepare for their flights.
You can access GAFOR in ForeFlight’s layer selector, near the middle of the right column. This layer displays GAFOR regions for France and Germany, and GAFOR routes for Switzerland, Austria, Slovenia, and Croatia. Zoom in to see color-coded markers representing the forecast periods for that region or route, with the current forecast period outlined in purple. The color and letter of each marker indicates the GAFOR Index for that forecast period, ranging from Clear and Open, to Difficult, Marginal, and Closed. If forecasts are unavailable for some period then the GAFOR Index will show a gray slash.
Tap on a marker to see more information about each forecast period, including the reference altitude for that region or route, the GAFOR Index, the Cloud Base height in feet, and the Visibility in kilometers. Information about specific weather phenomena, like thunderstorms, fog, snow, and others are sometimes also shown for countries that provide this data.
ForeFlight checks for GAFOR updates frequently to ensure that any new or changed forecasts are quickly reflected in the app. When you use the Pack feature for a flight in Europe, ForeFlight saves the latest GAFOR data so you can access it during the flight.