IRFP-01
Metro Review
b. Issued whenever any of the following weather phenomena
occur or are forecast to occur and affect an area of at least
3,000 square miles
(1) Severe or extreme turbulence or clear air turbulence (CAT)
not associated with thunderstorms (see Turbulence
Reporting Tables in FLIP Flight Information Handbook
(FIH) Section C)
(2) Severe icing not associated with thunderstorms (see Icing
Tables in FLIP FIH Section C)
(3) Widespread dust storms, sandstorms, or volcanic ash
lowering surface and/or in-flight visibilities to less than
3 miles
(4) Volcanic Eruption
10. AIRMETs (WA) 21.1.1.11.1
Fig 33:
AIRMET (WA)
a. Issued on a scheduled basis every 6 hours (beginning
at 0200 UTC)
NOTE: Scheduled issuance times are 15 minutes prior to valid
time.
b. Unscheduled amendments and corrections issued as
necessary and are valid beginning at the time of issuance
c.
Issued by NAWAU using the Area Forecast (FA) designators
(SFO, SLC, CHI, DFW, BOS, MIA) to denote the area covered,
not the issuing office
d. AIRMET bulletins shall contain details of conditions within their
designated geographical areas when one or more of the
following conditions occur or are expected to occur, and affect
an area of at least 3,000 square miles:
(1) Moderate icing
(2) Moderate turbulence
(3) Sustained surface wind of 30 kts or more
(4) Ceilings less than 1,000 ft and/or visibility less than 3 miles
affecting over 50% of an area at any one time
(5) Extensive mountain obscuration precluding VFR flight
(8-97) Original
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