Plain English Meaning

Official weather warnings sent to pilots while they fly. SIGMETs are the more serious warnings — bad icing, bad turbulence, thunderstorms, volcanic ash. AIRMETs are the lower-level warnings — moderate icing, moderate turbulence, strong surface winds, low clouds, and poor visibility. The MFD can display the areas these warnings cover so the pilot can see if their route is affected.

Full Definition

In-flight weather advisories issued by the to pilots to potentially . SIGMETs warn of affecting all , such as , , widespread duststorms, , or volcanic ash. cover -related . AIRMETs warn of less severe but still significant conditions primarily affecting smaller aircraft, including moderate icing, moderate turbulence, of 30 or greater, widespread reduced visibility below 3 , below 1,000 feet, and . On an MFD, these appear as overlays showing the geographic areas they cover.