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and the Airmen's Meteorological Information
(AIRMET). All of these advisories use the same
location identifiers (either VORs, airports, or
well-known geographic areas) to describe the
hazardous weather areas. See FIG GEN 3.5-3 and
FIG GEN 3.5-4. Graphics with improved clarity can
be found in Advisory Circular AC00-45E, Aviation
Weather Services, which is available on the following
web site: http://www.faa.gov.
3.9.1.3 Two other weather products supplement
these Inflight Aviation Weather Advisories:
a) The Severe Weather Watch Bulletins(WWs),
(with associated Alert Messages) (AWW), and
b) The Center Weather Advisories (CWAs).
3.9.2 SIGMET (WS)/AIRMET (WA)
SIGMETs/AIRMETs are issued corresponding to the
Area Forecast (FA) areas described in FIG
GEN3.5-4, FIG GEN 3.5-6 and FIG GEN 3.5-6.
The maximum forecast period is 4hours for
SIGMETs and 6 hours for AIRMETs. Both advisories
are considered “widespread” because they must be
either affecting or be forecasted to affect an area of at
least 3,000 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 in actuality only a small
portion of this total area would be affected at any one
time.
30 AUG 07
AIP
United States of America
GEN 3.5-11
15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG GEN 3.5-2
EFAS Radio Coverage Areas
NOTEEFAS
radio coverage at 5000 feet AGL. The shaded areas depict limited coverage areas in which altitudes above 5000 feet
AGL would be required to contact EFAS.
30 AUG 07
AIP
United States of America
GEN 3.5-12
15 MAR 07
Nineteenth Edition Federal Aviation Administration
FIG GEN 3.5-3
Inflight Advisory Plotting Chart
1304 AFUEBG 0087
AIP
United States of America
GEN 3.5-13
15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG GEN 3.5-4
Geographical Areas and Terrain Features
30 AUG 07
AIP
United States of America
GEN 3.5-14
15 MAR 07
Nineteenth Edition Federal Aviation Administration
FIG GEN 3.5-5
Aviation Area Forecasts
FA Locations - Contiguous United States
FIG GEN 3.5-6
Alaska Area Forecast Sectors
30 AUG 07
AIP
United States of America
GEN 3.5-15
15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG GEN 3.5-7
Hawaii Area Forecast Locations
3.9.3 SIGMET (WS)
3.9.3.1 A SIGMET advises of nonconvective
weather that is potentially hazardous to all aircraft.
SIGMETs are unscheduled products that are valid for
4 hours. However, conditions that are associated with
hurricanes are valid for 6 hours. Unscheduled updates
and corrections are issued as necessary. In the
conterminous U.S., SIGMETs are issued when the
following phenomena occur or are expected to occur:
a) Severe icing not associated with thunderstorms.
b) Severe or extreme turbulence or clear air
turbulence (CAT) not associated with thunderstorms.
c) Dust storms or sandstorms lowering surface or
inflight visibilities to below 3 miles.
d) Volcanic ash.
3.9.3.2 In Alaska and Hawaii, SIGMETs are also
issued for:
a) Tornadoes.
b) Lines of thunderstorms.
c) Embedded thunderstorms.
d) Hail greater than or equal to 3/4 inch in diameter.
3.9.3.3 SIGMETs are identified by an alphabetic
designator from November through Yankee excluding
Sierra and Tango. (Sierra, Tango, and Zulu are
reserved for AIRMETs.) The first issuance of a
SIGMET will be labeled as UWS (Urgent Weather
SIGMET). Subsequent issuances are at the forecasters
discretion. Issuance for the same phenomenon
will be sequentially numbered, using the original
designator until the phenomenon ends. For example,
the first issuance in the Chicago (CHI) FA area for
phenomenon moving from the Salt Lake City (SLC)
FA area will be SIGMET Papa 3, if the previous two
issuances, Papa 1 and Papa 2, had been in the SLC FA
area. Note that no two different phenomena across the
country can have the same alphabetic designator at
the same time.
EXAMPLEExample
of a SIGMET:
BOSR WS 050600
SIGMET ROMEO 2 VALID UNTIL 051000
ME NH VT
FROM CAR TO YSJ TO CON TO MPV TO CAR
MOD TO OCNL SEV TURB BLW 080 EXP DUE TO STG
NWLY FLOW. CONDS CONTG BYD
1000Z.
3.9.3.4 Convective SIGMET (WST)
a) Convective SIGMETs are issued in the
conterminous U.S. for any of the following:
1) Severe thunderstorm due to:
(a) Surface winds greater than or equal to
　
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