AIRMET

Compared to SIGMETs, AIRMETs cover less severe weather: moderate turbulence and icing, sustained surface winds of 30 knots or more, or widespread restricted visibility.

Today, according to the advancement of technology in civil aviation, the AIRMET is sent as IWXXM model.

[1] AIRMETs are broadcast on the ATIS at ATC facilities, and are referred to as Weather Advisories.

There are three types of AIRMET, all identified by a phonetic letter: S (Sierra), T (Tango), and Z (Zulu).

[4] The TAC AIRMET is being retired,[5] and only G-AIRMETs will be disseminated for the continental US starting on or about January 27, 2025.