What does "TEMPO" indicate in a TAF forecast?

The term "TEMPO" in a TAF forecast signifies temporary fluctuations in weather conditions expected to occur for brief periods within the overall forecast window. When forecasters use "TEMPO," they are indicating that specific weather phenomena, such as precipitation, thunderstorms, or visibility changes, are anticipated to arise but are not expected to persist continually. This differentiation helps pilots and aviation personnel prepare for short-lived weather impacts, enabling them to make more informed decisions while operating flights during the forecast period.

While the other options describe various aspects of weather forecasting, they do not capture the essence of "TEMPO" as it specifically relates to transient weather phenomena occurring during a defined timeframe within the TAF. Understanding this distinction is vital for effective flight operations and safety management in aviation.