ATPL Meteorology Practice Exam - Prep Guide & Practice Questions

A METAR trend forecast is valid for a period of 2 hours. This type of forecast provides information on expected changes in weather conditions at an airport or reporting station, based on the latest METAR observation. It gives pilots and flight planners insight into potential short-term trends such as changes in wind direction, visibility, and weather phenomena, which are critical for flight operations.

Given the transient nature of weather, a 2-hour validity period allows for timely adjustments while ensuring that forecasters can provide relevant and actionable information. Trends beyond this time frame can be less reliable due to the dynamic nature of atmospheric conditions, making shorter forecasts more practical for immediate operational needs.