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shall not include references to associated turbulence and icing.
1.1.6 Recommendation.- Meteorological watch offices
in a position to do so should issue SIGMET information for
volcanic ash cloud and tropical cyclones in graphical format
using the WMO BUFR code form, in addition to the issuance
of this SIGMET information in abbreviated plain language in
accordance with 1.1.1.
Note.- The BUFR code form is contained in WMO
Publication No. 306, Manual on Codes, Volume 1.2, Part B -
Binary Codes.
1.2 Dissemination of SIGMET messages
1.2.1 SIGMET messages shall be disseminated to
meteorological watch ofices, WAFCs and to other meteorological
ofices in accordance with regional air navigation
agreement. SIGMET messages for volcanic ash shall also be
disseminated to VAACs.
1.2.2 SIGMET messages shall be disseminated to international
OPMET data banks and the centres designated by
regional air navigation agreement for the operation of
aeronautical fixed service satellite distribution systems, in
accordance with regional air navigation agreement.
- surface wind speed
- widespread mean surface SFC WSPD
wind speed above (+ wind speed and units)
60 km/h (30 kt)
- surface visibility
- widespread areas affected
by reduction of
visibility to less than
5 000 m, including the
weather phenomenon
causing the reduction of
visibility
SFC VIS
(+ visibility)
(+ one of the following
weather phenomena
or combinations thereof:
BR, DS, DU, DZ, FC,
FG, FU, GR, GS, HZ,
IC, PL, PQ, RA,
SA, SG, SN, SQ, SS
or VA)
- thunderstorms
- isolated thunderstorms ISOL TS
without hail
- occasional thunderstorms OCNL TS
without hail
- isolated thunderstorms ISOL TSGR
with hail
- occasional thunderstorms OCNL TSGR
with hail
- mountain obscuration
- mountains obscured MT OBSC
- cloud
- widespread areas of broken
2. SPECIFICATIONS RELATED TO or overcast cloud with
AIRMET INFORMATION height of base less than
300 m (1 000 ft)
2.1 Format of AIRMET messages
I . above ground level:
- broken BKN CLD (+ height of
the base and top
2.1.1 The content and order of elements in an AIRMET -
message shall be in accordance with the template shown in
Table A6-1.
2.1.2 The sequence number referred to in the template in
Table A6-1 shall correspond with the number of AIRMET
messages issued for the flight information region since
0001 UTC on the day concerned. The meteorological watch
ofices whose area of responsibility encompasses more than
one FIR and/or CTA shall issue separate AIRMET messages
for each FIR and/or CTA within its area of responsibility.
2.1.3 The flight information region shall be divided in
sub-areas, as necessary.
2.1.4 In accordance with the template in Table A6-1, only
one of the following phenomena shall be included in an
AIRMET message, using the abbreviations as indicated below: -
at cruising levels below flight level 100 (or below flight level
150 in mountainous areas, or higher, where necessary):
overcast
and units)
OVC CLD (+ height of
the base and top
and units)
- cumulonimbus clouds
which are:
- isolated ISOL CB
- occasional OCNL CB
- frequent FRQ CB
- towering cumulus clouds
which are:
- isolated ISOL TCU
- occasional OCNL TCU
- frequent FRQ TCU
. icing
- moderate icing MOD ICE
(except for icing
in convective clouds)
25/11/04 APP 6-2
Appendix 6 Annex 3 - Meteorological Service for International Air Navigation
- turbulence
- moderate turbulence MOD TURB
(except for turbulence in
convective clouds)
- mountain wave
- moderate mountain wave MOD MTW
2.1.5 AIRMET information shall not contain unnecessary
descriptive material. In describing the weather phenomena for
which the AIRMET is issued, no descriptive material
additional to that given in 2.1.4 shall be included. AIRMET
information concerning thunderstorms or cumulonimbus
clouds shall not include references to associated turbulence
and icing.
Note.- The speczfzcations for SIGMET information which
is also applicable to low-levelflights are given in 1.1.4.
2.2 Dissemination of AIRMET messages
2.2.1 Recommendation.- AIRMET messages should be
disseminated to meteorological watch offices in adjacentflight
information regions and to other meteorological offices, as
agreed by the meteorological authorities concerned.
2.2.2 Recommendation.- AIRMET messages should be
transmitted to international operational meteorological data
　
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