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Publication No. 306, Manual on Codes, Volume I.1, Part A -
Alphanumeric Codes.
4.1.3 Recommendation.- The order of the elements in
area and route forecasts (or amendments thereto) in abbreviated
plain language should normally follow that of the
APP 5-5 25/11/04
Annex 3 - Meteorological Service for International Air Navigation Appendix 5
corresponding coded form of message. The terminology and
units employed should be consistent with those used in the
related aerodrome reports and forecasts. The identifier
employed should be "AREA FCST" or "ROUTE FCST",
respectively, preceded in the case of amendments by "AMD".
The CAVOK procedure applied in TAF should not be used in
area and route forecasts.
4.2 Amendments to area and route forecasts
4.2.1 A list of criteria to be used for amendments to area
and route forecasts shall be established by the meteorological
authority, in consultation with operators and other users
concerned.
4.2.2 Amendments to area and route forecasts shall be
issued in accordance with criteria in Appendix 2, 1.4.
5. CRITERIA RELATED TO AREA
FORECASTS FOR LOW-LEVEL FLIGHTS
5.1 Format and content of
GAMET area forecasts
When prepared in GAMET format, they shall contain two
sections: Section I related to information on en-route weather
phenomena hazardous to low-level flights, prepared in support
of the issuance of AIRMET information, and Section 11 related
to additional information required by low-level flights. The
area forecasts shall contain the following information as
necessary and, when prepared in GAMET format, in the order
indicated. Additional elements in Section I1 shall be included
in accordance with regional air navigation agreement:
a) location indicator of the air traffic services unit serving
the flight information region(s) to which the area forecast
for low-level flights refers; for example, "WCC";
b) message identification using the abbreviation "GAMET";
c) date-time groups indicating the period of validity in
UTC; for example, "VALID 220600122 1200";
d) location indicator of the meteorological office originating
the message, followed by a hyphen to separate the
preamble from the text; for example, "YUDO-";
e) on the next line, name of the flight information region,
or a sub-area thereof, for which the area forecast for
low-level flights is issued; for exampIe "AMSWELL
FIR/2 BLW FL 120";
f) on the next line, indication of the beginning of the first
section of the area forecast using the abbreviation
"SECN I";
g) widespread mean surface wind speed exceeding 60 kmh
(30 kt); for example, "SFC WSPD: 10112 65 KMH;
h) widespread areas of surface visibility below 5 000 m
including the weather phenomena causing the reduction
of visibility; for example, "SFC VIS: 06108 3000 M BR
N OF N51";
i) significant weather conditions encompassing thunderstorms
and heavy sand- and duststorm (except for
phenomena for which a SIGMET message has already
been issued); for example, "SIGWX: 11112 ISOL TS";
j) mountain obscuration; for example, "MT OBSC: MT
PASSES S OF N48";
k) widespread areas of broken or overcast cIoud with
height of base less than 300 m (1 000 fi) above ground
level (AGL) or above mean sea level (AMSL) andlor
any occurrence of cumulonimbus (CB) or towering
cumulus (TCU) clouds, giving height indications of
their bases and tops; for example, "SIG CLD: 06109
OVC 80011 100 FT AGL N OF N51 10112 ISOL TCU
1200/8000 FT AGL";
I) icing (except for that occumng in convective clouds and
for severe icing for which a SIGMET message has
already been issued); for exampIe, "ICE: MOD
FL0501080";
@turbulence (except for that occumng in convective
clouds and for severe turbulence for which a SIGMET
message has already been issued); for example, "TURl3:
MOD ABV FL090";
n) mountain wave (except for severe mountain wave for
which a SIGMET message has already been issued); for
example, "MTW: MOD ABV FL080 E OF N63";
o) SIGMET messages applicable to the FIR concerned or
the sub-area thereof, for which the area forecast is valid;
for example, "SIGMET APPLICABLE: 3,s";
p) on the next line, indication of the beginning of the
second section of the area forecast using the abbreviation
"SECN 11";
q) pressure centres and fronts. and their expected
movements and developments; for example, "PSYS: 06
L 1004 HPA N5 130 E01000 MOV NE 25 KT WKN;
　
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