Area Forecasts and the Graphical Forecasts for Aviation (GFA)

Aviation weather forecasting has evolved dramatically in recent decades. For most of the twentieth century, pilots relied on the text-based Area Forecast (FA) to understand expected en-route weather across broad geographic regions. Today, the Aviation Weather Center's (AWC) Graphical Forecasts for Aviation (GFA) tool has replaced the traditional continental U.S. FA, while text-based Area Forecasts survive for specific, operationally complex regions. Understanding both products — what they cover, how to read them, and how they fit into the broader suite of aviation forecasts — is essential for safe preflight planning and written-test success.

The FAA Aviation Weather Handbook (FAA-H-8083-28B), Chapter 27, organizes the full landscape of aviation forecasts, from Winds and Temperatures Aloft to convective outlooks, icing products, turbulence guidance, and more. Area Forecasts and the GFA occupy a central role within that landscape because they describe en-route conditions across large areas rather than conditions at a single airport, which is the domain of the Terminal Aerodrome Forecast (TAF).

Area Forecasts: What They Are and Where They Still Apply

An Area Forecast (FA) is a text forecast describing expected weather conditions over a wide geographic area, typically covering clouds, general weather, icing, and turbulence at various altitude levels. The FA was historically produced for six regions of the contiguous United States, but those continental FAs were officially retired when the GFA tool became the operational replacement.

However, Area Forecasts remain active and operationally important for regions where the GFA does not yet provide equivalent coverage:

• Alaska FA — covering the complex, mountainous, and sparsely instrumented Alaskan airspace.
• Hawaii FA — addressing the unique maritime and orographic weather of the Hawaiian Islands.
• Gulf of Mexico and Caribbean FA — supporting offshore, overwater, and island operations across the Gulf and Caribbean basin.

Each of these regional FAs is produced by the NWS and formatted as a text product. They typically include a synopsis (broad description of the weather pattern), clouds and weather section (organized by sub-areas), icing, and turbulence remarks. Altitudes in text FAs are expressed in hundreds of feet MSL for cloud bases and tops, and in flight levels (FL) above 18,000 feet.

Alaska also benefits from a parallel set of Alaska Graphical Forecasts, which include graphical depictions of flying weather, surface conditions, icing, turbulence, and convective outlook — mirroring the graphical philosophy of the GFA for the lower 48.

The Graphical Forecasts for Aviation (GFA) Tool

The GFA tool, hosted on the Aviation Weather Center website, replaced the continental U.S. FA and represents a major leap forward in how pilots visualize en-route weather. Rather than decoding paragraphs of coded text, pilots interact with color-coded graphical overlays on a map, selecting the weather element and forecast time they need.

The GFA draws on the most current numerical weather prediction (NWP) model output — including the NWS Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) models — rather than relying solely on manually prepared text. This means the displayed wind and temperature data can be updated as frequently as every hour and can provide grid-point resolution as fine as 9 nautical miles at full zoom, a dramatic improvement over the legacy FB Winds product, which was updated only four times daily and had station spacing of roughly 100–150 miles.

The GFA organizes its forecast layers into several key product categories, each available at multiple forecast valid times (typically out to 18 hours for most layers):

• Clouds — sky cover, cloud bases, and cloud tops by layer.
• Weather — precipitation type and intensity, visibility, and obstructions to vision such as fog, smoke, or haze.
• Winds — direction and speed at user-selected altitude levels, sourced from current model output.
• Turbulence — based on the Graphical Turbulence Guidance (GTG) product.
• Icing — based on the Forecast Icing Product (FIP), showing probability and severity of in-flight icing.
• Freezing levels — the altitude of the 0°C isotherm, critical for icing hazard assessment.

Each layer can be animated through valid forecast times, allowing a pilot to watch the progression of a frontal system, a band of icing, or an area of IFR conditions across the planned route.

Why the GFA Matters for Preflight Planning

The retirement of the continental text FA for the lower 48 was driven by a straightforward operational reality: the GFA provides richer, more spatially precise, and more frequently updated information. Consider the comparison within the winds aloft domain. The legacy FB Winds product is still produced four times daily, covers only a sparse network of reporting locations, and brackets large time windows (for instance, a 6-hour forecast valid for use across a roughly 4-hour window). The Rapid Refresh model winds available on the GFA tool, by contrast, update every hour, provide a forecast for each individual hour into the future, and resolve terrain-influenced wind variations at a scale the FB product simply cannot match.

For the practical pilot, the GFA serves as the primary tool for answering en-route weather questions that a TAF cannot answer. TAFs cover conditions within a 5 statute mile radius of the center of the airport and are typically valid for 24 or 30 hours. The GFA covers the entire CONUS and helps answer questions like: Will I encounter a layer of clouds between my departure and destination airports? Where is the freezing level along my route? Is icing forecast above the mountains I plan to cross?

How the GFA Fits Into the Broader Forecast Suite

Chapter 27 of FAA-H-8083-28B makes clear that the GFA is one part of a comprehensive set of aviation forecast tools. Pilots should understand how the GFA complements rather than replaces other products:

• TAFs provide the highest-confidence, site-specific forecast for departure, destination, and alternate airports. Always consult TAFs for terminal weather decisions.
• SIGMETs and AIRMETs issue specific hazard advisories for icing, turbulence, IFR conditions, and convection that are not always apparent from the GFA alone.
• Convective outlooks and convective products — including the Traffic Flow Management Convective Forecast (TCF) and Extended Convective Forecast Product (ECFP) — address thunderstorm hazards in more detail than the GFA's weather layer.
• PIREPs (Pilot Reports) provide real-time ground-truth data that can confirm or contradict forecast products, including the GFA.
• Surface Prognostic Charts and Upper Air Forecasts help pilots understand the synoptic-scale pattern driving the forecast conditions shown on the GFA.

Decoding Legacy FB Winds: Still Tested

Even though FB Winds are considered archaic compared with model output, the coded text format remains on written-test question banks and is covered in the handbook. The format follows the symbolic pattern DDff+TT, where DD is wind direction in tens of degrees true, ff is speed in knots, and TT is temperature in degrees Celsius. Key decoding rules include:

• Light and variable winds (or speeds below 5 knots) are encoded as 9900.
• When the wind speed is between 100 and 199 knots, 50 is added to the direction digits and 100 is subtracted from the speed. For example, 7545 decodes as 250° at 145 knots.
• Wind speeds of 200 knots or greater are simply reported as 199 knots (e.g., 7799 = 270° at 199 knots or more).
• Temperature signs are shown for 6,000 through 24,000 feet. Above 24,000 feet, the sign is omitted as a coding convention because temperatures at those levels are forecast to always be negative.
• Wind forecasts are not issued within 1,500 feet of a station's elevation; temperature forecasts are not issued within 2,500 feet of a station's elevation.

Common Test Traps

• Assuming the continental FA still exists. The text FA for the contiguous United States has been replaced by the GFA. Text FAs survive only for Alaska, Hawaii, and the Gulf of Mexico/Caribbean region.
• Misreading high-speed FB wind codes. Forgetting to add 50 to the direction and subtract 100 from the speed when a forecast exceeds 99 knots is one of the most common decoding errors on written tests.
• Confusing temperature sign conventions. Students often apply a sign to temperatures above 24,000 feet or forget the sign between 6,000 and 24,000 feet — the rule is: explicit sign below FL240, no sign above.
• Treating the GFA as a replacement for TAFs. The GFA covers broad en-route areas; TAFs remain the authoritative source for terminal-specific conditions at the departure and destination airports.
• Ignoring product age on FB Winds. Because FB Winds update only four times a day with windows of use up to several hours long, a significant change in the actual wind pattern may not be reflected until the next scheduled issuance — a limitation the hourly GFA model output does not share.