What values are used for Winds Aloft Forecasts?

Winds Aloft Forecasts utilize true direction and knots as the standard for reporting wind information. True direction provides a reference based on the Earth's geographic poles, which is critical for navigation and flight planning, ensuring that pilots can accurately determine the wind's influence on their flight path. Knots, on the other hand, are a standard unit of measurement for wind speed in aviation, equating to nautical miles per hour. This unit is widely accepted and used in aeronautical meteorology, making it integral to pilots and flight operations.

In this context, other options fall short because they either use magnetic references, which can lead to inaccuracies due to magnetic variation, or incompatible units of measure. The combination of true direction and knots ensures that pilots are equipped with precise and reliable information for flight safety and efficiency.