Airmet

AIRMET (Airmen's Meteorological Information) is a weather advisory issued to notify pilots of meteorological conditions that may be hazardous to light aircraft and VFR operations, but are generally not severe enough to warrant a SIGMET. AIRMETs cover moderate turbulence, moderate icing, sustained surface winds of 30 knots or more, widespread ceilings below 1,000 feet and/or visibility below 3 statute miles, and extensive mountain obscuration.

In the United States, AIRMETs are categorized as:

• AIRMET Sierra (S): IFR conditions and mountain obscuration
• AIRMET Tango (T): Turbulence and sustained surface winds
• AIRMET Zulu (Z): Icing and freezing levels

AIRMETs are issued every 6 hours with amendments as needed. They are gradually being replaced by Graphical AIRMETs (G-AIRMETs) in some regions.