Definition
A forecast issued by the National Weather Service that predicts wind direction, wind speed, and air temperature at specified altitudes for selected locations across the country, valid for set time periods. Wind direction is given in degrees true, wind speed in knots, and temperature in degrees Celsius. Temperatures are not forecast for altitudes within 2,500 feet of station elevation, and winds are not forecast for altitudes within 1,500 feet of station elevation.
Plain English
A weather product that tells pilots what the wind and temperature will be at various altitudes above different points in the country at certain times.
Context Anchor
Used during preflight weather planning when choosing an altitude, estimating groundspeed, and checking expected temperatures along the route.
Derivation
Aloft means “up in the air.” Forecast means a prediction made before the weather happens. Together, the phrase points to a prediction of wind and temperature conditions above the surface.
Why Pilots Care
It helps pilots choose the most efficient altitude, anticipate fuel burn, and avoid unexpected headwinds or icing conditions.
Grounding Statement
Before takeoff, this forecast helps the pilot picture what the air will be doing at cruising altitude.
Intuition Check
This is not a report of the wind and temperature right now at the runway. It is a forecast for conditions higher in the air, at selected altitudes.
Example Sentence 1
Before departure, the pilot checked the winds and temperature aloft forecast and chose 9,000 feet for the strongest tailwind.
Example Sentence 2
Winds at 9000 feet were forecast from the northwest at 30 knots with a temperature of minus 8 Celsius.