From SKYbrary Wiki
|Tag(s)||Weather Risk Management|
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:
- Surface wind speed above 30 kt55.56 km/h
- Surface visibility below 5000 m
- Mountain obscuration
- Broken or overcast Cloud with base below 1000 ft
- Cumulonimbus (Cb) clouds
- Moderate or severe icing
- Moderate or severe turbulence
- Moderate or severe Mountain Waves
ICAO Annex 3 Chapter 7