An AIRMET is a message containing information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of low-level aircraft operations and which was not already included in the forecast issued for low-level flights in the flight information region concerned.

In this context, low-level operations means flight below FL100 (or below FL150 or higher in mountainous areas).

An AIRMET gives a concise description of the phenomena in abbreviated plain language.

The following are examples of weather phenomena that may be described in an AIRMET:

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Further Reading

ICAO Annex 3 Chapter 7


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