Plain English Meaning

Weather warnings issued to pilots while they are flying, telling them about dangerous weather like icing, turbulence, low visibility, or thunderstorms in a specific area for a specific time.

Full Definition

Forecasts issued by the National Weather Service to alert pilots in flight to potentially hazardous weather. They are broadcast and made available through Flight Service and include AIRMETs (less severe), SIGMETs (severe and widespread), and Convective SIGMETs (-related). Each describes the of , the area affected, and the time it covers.