The Point Forecast Sheds New Light on TAFs

A terminal aerodrome forecast, simply known as a TAF, is perhaps the most difficult forecast any meteorologist will ever make. A TAF is essentially an hour-by-hour forecast for conditions significant to aviation at an airport over the next 24 or 30 hours.

Scott Dennstaedt, Ph.D

Tuesday, November 14, 2023 at 09:04 AM ET

Verified

The TAF is one of the most difficult forecasts to make in aviation weather. [Adobe Stock]

Key Takeaways:

Terminal Aerodrome Forecasts (TAFs) are highly challenging "point forecasts" due to their focus on a tiny 5-statute-mile radius around an airport, often smaller than the resolution of the forecast guidance.
Forecasters face limitations in quantifying uncertainty within TAFs, often using placeholder terms (e.g., SHRA, VCSH) for uncertain conditions like thunderstorms, partly due to operational pressures from airlines.
Area Forecast Discussions (AFDs) are crucial for pilots to understand forecaster reasoning, local effects, and quantify uncertainty not explicit in the TAF, making them an essential part of a complete preflight briefing.
TAFs are specific to an airport's terminal area and should not be used as general area or zone forecasts; their surface precipitation forecasts also may not reflect conditions at higher altitudes.

See a mistake? Contact us.

As a flight instructor and former National Weather Service (NWS) research meteorologist, I’ve accepted that pilots like to rag on meteorologists for issuing bad forecasts. Even so, once I got the full backstory behind the pilot’s dissent for a majority of these cases, there was nothing inherently wrong with the forecast; it was how the pilot was trying to use the forecast that was often problematic. This is not to imply that meteorologists are always accurate in every forecast they issue, but pilots tend not to appreciate the hard limitations these forecasts demand.

A terminal aerodrome forecast, simply known as a TAF, is perhaps the most difficult forecast any meteorologist will ever make. Think about the challenge these forecasters face. A TAF is essentially an hour-by-hour forecast for conditions significant to aviation at an airport over the next 24 or 30 hours. This includes a forecast for details such as wind speed and direction, cloud coverage, ceiling height, prevailing visibility, and precipitation type.