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|An AIRMET (AIRman's METeorological
Information) advises of weather potentially hazardous to all aircraft
but that does not meet SIGMET criteria.
AIRMETs are issued by the National Weather
Weather Center (for the lower 48 states and adjacent coastal
waters) for the following weather-impacted reasons:
These AIRMET items are considered to be widespread
because they must be affecting or be forecast to affect an area of at
least 3000 square miles at any one time. However, if the total area to
be affected during the forecast period is very large, it could be that
only a small portion of this total area would be affected at any one
- Instrument Flight Rules (IFR) or Mountain Obscuration -
- Ceilings less than 1000 feet and/or visibility less than 3 miles
affecting over 50% of the area at one time.
- Extensive mountain obscuration
- Moderate Turbulence
- Sustained surface winds of greater than 30 knots at the surface
- Moderate icing
- Freezing levels
AIRMETs are routinely issued for 6 hour periods
beginning at 0245 UTC. AIRMETS are also amended as necessary due to
changing weather conditions or issuance/cancellation of a SIGMET.
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