What is the standard radius of a TAF?

The standard radius of a TAF, or Terminal Aerodrome Forecast, is indeed 5 nautical miles. This forecast provides critical weather information for the vicinity of an airport, specifically intended for the area around that aerodrome. The 5 nm radius ensures that the forecast is relevant for pilots and air traffic controllers who need accurate and timely information for flight operations in the immediate area surrounding the airport.

While other radius options range from 10 nm to 20 nm, they exceed the standard radius defined in TAF guidelines, which are specifically tailored to cover the most critical area affecting airport operations. Hence, 5 nm is the recognized and standardized measurement for TAF forecasts.