What does 'TEMPO' mean in a TAF?

In a Terminal Aerodrome Forecast (TAF), the term 'TEMPO' refers specifically to temporary weather conditions expected to occur for brief periods within the forecast period. This term is used to indicate that the weather conditions will deviate from the main forecast but are expected to be short-lived. For example, if a TAF is predicting generally clear skies but includes a 'TEMPO' for periods of rain, it suggests that rain will occur intermittently, but the predominant weather will remain otherwise.

The use of 'TEMPO' is critical for pilots and other aviation personnel, as it communicates the potential for fluctuating weather that could impact flight operations, even if those conditions are not the primary forecast. This allows for better planning and risk management while flying in and out of an aerodrome. Understanding this terminology helps ensure that flight crews can anticipate and respond to changing weather scenarios appropriately.