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r) upper winds and upper-air temperatures for at least the
following altitudes: 600, 1 500 and 3 000 m (2 000,
5 000 and 10 000 ft); for example, "WINDE 2000 FT
270170 KMH PS03 5000 FT 250180 KMH MS02 10000
FT 240185 KMH MS 1 1";
s) cloud information not included under k), giving cloud
amount, type and height indications of the bases and
2511 1104 APP 5-6
Appendix 5 Annex 3 - Meteorological Service for International Air Navigation
tops above ground level (AGL) or above mean sea level
(AMSL); for example, "CLD: BKN SC 250018000 FT
AGL";
t) height indication of 0" C level(s) above ground level
(AGL) or above mean sea level (AMSL), if lower than
the top of the airspace for which the forecast is supplied;
for example, "FZLVL: 3000 FT AGL";
u) forecast lowest QNH during the period of validity; for
example, "MNM QNH: 1004 HPA";
v) sea-surface temperature and state of the sea if required
by regional air navigation agreement; for example,
"SEA: T15 HCX 5 M ; and
w) location of volcanic eruptions which are producing ash
clouds of significance to aircraft operations, name of
volcano and time of first eruption, if known; for
example, "VA: MT. HOKKAIDO KOMAGATAKE
PSN N4255 El4040 ERUPTED VA CLD TOP 4900 FT
MOV SE".
Each of the items g) to o) and q) to w) shall, when applicable,
be included in the GAMET area forecast beginning on a new
line and include an indication of the location (referring where
possible, to latitude and longitude andlor locations or
geographic features well known internationally) and level,
where appropriate. Items g) to o) for which no hazardous
phenomenon is expected to occur, or which are already
covered by a SIGMET message, shall be omitted from the area
forecast. When no weather phenomena hazardous to low-level
flights occur and no SIGMET information is applicable, the
term "HAZARDOUS WX NIL" shall replace all items listed
under g) to 0).
5.2 Amendments to GAMET area forecasts
When a weather phenomenon hazardous to low-level flights
has been included in the GAMET area forecast and the
phenomenon forecast does not occur, or is no longer forecast,
a GAMET AMD shall be issued, amending only the weather
element concerned.
Note.- Specifications regarding the issuance of AIRMET
information amending the area forecast in respect of weather
phenomena hazardous for low-level flights are given in
Appendix 6.
5.3 Exchange of area forecasts for low-level flights
Area forecasts for low-level flights prepared in support of the
issuance of AIRMET information shall be exchanged between
meteorological offices responsible for the issuance of flight
documentation for low-level flights in the flight information
regions concerned.
APP 5-7
Annex 3 - Meteorological Service for International Air Navigation
Table AS-1. Template for TAF
Key: M = inclusion mandatory, part of every message Note I . - The ranges and resolutions for the numerical
C = inclusion conditional, dependent on elements included in TAF are shown in Table AS-3 of this
meteorological conditions or method of appendix.
observation
0 = inclusion optional Note 2.- The explanations for the abbreviations used can
be found in the Procedures for Air Navigation Services -
ICAO Abbreviations and Codes (PANS-ABC, Doc 8400).
APP 5-8
Nement as specified
in Chapter 6
Identification of the type
of forecast (M)
Location indicator (M)
Time of issue of forecast
(M)
Identitication of a
missing forecast (C)
Detailed content
Type of forecast (M)
ICAO location indicator (M)
Day and time of issue of the
forecast in UTC (M)
Missing forecast identifier (C)
END OF TAF IF THE FORECAST IS MISSING.
Template(s)
TAF or TAF AMD or TAF COR
nnnn
nnnnnnZ
NIL
Day and period of
validity of forecast (M)
Identification of a
cancelled forecast (C)
Examples
TAF
TAF AMD
YUDO'
1600002
NIL
Day and peliod of the validity of the
forecast in UTC (M)
Cancelled forecast identifier (C)
END OF TAF IF THE FORECAST IS CANCELLED.
nnnnnn
CNL
Surface wind (M)
Visibility (M)
160624
08091 8
CNL
Wind direction (M)
Wind speed (M)
Significant speed variations (c13
Units of measurement (M)
Prevailing visibility (M)
24015KMH; VRB04KMH
(24008KT); (VRBO2KT)
19022KMH
(19011KT)
OOOOOKMH
(OOOMKT)
140P199KMH
(140P99KT)
12012G35KMH
(12006G1 BKT)
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