IRFP-01
Metro Review
(4) Severe or extreme turbulence
(5) Severe icing
(6) Widespread sandstorms or dust storms limiting visibility to
2 sm or less
f.
Flight restrictions
(1) Training activities suspended in CAWW area
(2) Exceptions to CNATRA severe weather restrictions (same
as OPNAVINST 3710.7)
(a) Operational necessity
(b) Research/weather reconnaissance
(c) Emergencies
(d) Storm development has not progressed as forecast
and when flight
i)
Remains in VFR conditions, or
ii)
If in IFR conditions, aircraft has operable weather
radar
(e) Aircraft capable of flying above existing or developing
severe storms
H. National Weather Service (NWS) Aviation In-flight Weather Advisories
21.1.1.11, 21.1.1.11.1, 21.1.1.11.2
1. Provides information for en route aircraft
2. Designed to serve both civilian and military pilots
3. Types
a. Significant Meteorological (SIGMET) Advisories
(1) Convective SIGMETs (WST)
(2) Nonconvective SIGMETs (WS)
b. Airman’s Meteorological (AIRMET) Advisories (WA)
4. Latest revisions to program designed to meet overlapping
requirements of large versus small aircraft, aircraft operating under
visual flight rules (VFR) and instrument flight rules (IFR), small
aircraft operating higher, and larger aircraft sometimes operating
lower
(8-97) Original
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