What constitutes a TEMPO change in weather forecasts?

A TEMPO change in weather forecasts refers specifically to short-term changes in weather conditions, particularly concerning ceiling and visibility. This term is used in aviation and meteorology to signify fluctuations that can occur within a forecast period, lasting for a limited duration, typically less than an hour, and may involve variations such as rain, fog, or sudden drops in visibility and ceiling.

Understanding this concept is crucial for pilots and others who rely on accurate and timely weather information, as these short-term changes can significantly impact flight operations and safety. In contrast, other options discuss broader or different aspects of meteorological changes, such as long-term trends in weather patterns or stable conditions. These do not align with the specific definition of a TEMPO change, which is focused on brief, transient weather phenomena.