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mist);
significant weather phenomena: between 1100 UTC and 1200 UTC isolated thunderstorms without hail;
significant clouds: between 0600 UTC and 0900 UTC overcast base 800, top 1 100 feet above ground level
north of 51 degrees north; between 1000 UTC and 1200 UTC isolated towering
cumulus base 1 200, top 8 000 feet above ground level;
icing: moderate between flight level 050 and 080;
turbulence: moderate above flight level 090 (at least up to flight level 100);
SIGMET messages: 3 and 5 applicable to the validity period and sub-area concerned.
Section 11:
pressure systems: at 0600 UTC low pressure of 1 004 hectopascals at 51.5 degrees north 10.0 degrees
east, expected to move north-eastwards at 25 knots and to weaken;
winds and temperatures: at 2 000 feet above ground level wind direction 270 degrees; wind speed 70 kilometres
per hour, temperature plus 3 degrees Celsius; at 5 000 feet above ground level wind
direction 250 degrees; wind speed 80 kilometres per hour, temperature minus 2 degrees
Celsius; at 10 000 feet above ground level wind direction 240 degrees; wind speed
85 kilometres per hour, temperature minus 11 degrees Celsius;
clouds: broken stratocumulus, base 2 500 feet, top 8 000 feet above ground level;
freezing level: 3 000 feet above ground level;
minimum QNH: 1 004 hectopascals;
sea: surface temperature 15 degrees Celsius; and state of sea 5 metres;
volcanic ash: nil.
* Fictitious locations
APP 5-13
APPENDIX 6. TECHNICAL SPECIFICATIONS RELATED TO
SIGMET AND AIRMET INFORMATION, AERODROME WARNINGS
AND WIND SHEAR WARNINGS
(See Chapter 7 of this Annex.)
Note.- Data type designators to be used in abbreviated
headings for SIGMET, AIRMET, tropical cyclone and volcanic
ash advisory messages are given in WMO Publication
No. 386, Manual on the Global Telecommunication System.
1. SPECIFICATIONS RELATED TO
SIGMET INFORMATION
1.1 Format of SIGMET messages
1.1.1 The content and order of elements in a SIGMET
message shall be in accordance with the template shown in
Table A6-1.
1.1.2 Messages containing SIGMET information for
subsonic aircraft shall be identified as "SIGMET', those containing
SIGMET information for supersonic aircraft during
transonic or supersonic flight shall be identified as "SIGMET
SST'.
1.1.3 The sequence number referred to in the template in
Table A6-1 shall correspond with the number of SIGMET
messages issued for the flight information region since 0001
UTC on the day concerned. Separate series of sequence
numbers shall be used for "SIGMET' and "SIGMET SST"
messages. The meteorological watch offices whose area of
responsibility encompasses more than one FIR and/or CTA
shall issue separate SIGMET messages for each FIR and/or
CTA within its-area of responsibility.
1.1.4 In accordance with the template in Table A6- 1, only
one of the following phenomena shall be included in a
SIGMET message, using the abbreviations as indicated below:
a) at a subsonic cruising levels:
thunderstorm
- obscured
- embedded
- fiequent
- squall line
- obscured with hail
- embedded with hail
- frequent, with hail
- squall line with hail
OBSC TS
EMBD TS
FRQ TS
SQL TS
OBSC TSGR
EMBD TSGR
FRQ TSGR
SQL TSGR
tropical cyclone
- tropical cyclone TC (+ cyclone name)
with 1 0-minute
mean surface wind speed
of 63 lan/h (34 kt) or more
turbulence
- severe turbulence SEV TURB
icing
- severe icing SEV ICE
- severe icing due to SEV ICE (FZRA)
freezing rain
mountain wave
- severe mountain wave , SEV MTW
duststorm
-heavy duststorm HVY DS
sandstorm
-heavy sandstorm HVY SS
volcanic ash
- volcanic ash VA (+ volcano name,
(irrespective of altitude) if known)
b) at transonic levels and supersonic cruising levels:
turbulence
- moderate turbulence MOD TURB
- severe turbulence SEV TURB
cumulonimbus
- isolated cumulonimbus ISOL CB
- occasional cumulonimbus OCNL CB
- frequent cumulonimbus FRQ CB
hail
- hail
volcanic ash
- volcanic ash VA (+ volcano name,
(irrespective of altitude) if known)
1.1.5 SIGMET information shall not contain unnecessary
descriptive material. In describing the weather phenomena for
which the SIGMET is issued, no descriptive material
ANNEX 3 APP 6-1 25/11/04
Annex 3 - Meteorological Service for International Air Navigation Appendix 6
additional to that given in 1.1.4 shall be included. SIGMET
information concerning thunderstorms or a tropical cyclone
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