Plain English Meaning

WA is the label stamped on a weather report so pilots and computers know it's an AIRMET — a heads-up about weather that's significant but not severe.

Full Definition

WA is the two-letter product code that identifies a weather bulletin as an AIRMET. It appears in the header of the text product transmitted by the Aviation Weather Center and tells the pilot, dispatcher, or briefing system that the message contains AIRMET information about moderate icing, moderate turbulence, sustained surface winds of 30 knots or more, widespread IFR conditions, or mountain obscuration.