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Example A6-1. SIGMET and AIRMET message and the corresponding cancellations
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SIGMET Cancellation of SIGMET
YUDD SIGMET 2 VALID 1012001101600 WSO- YUDD SIGMET 3 VALID 101 34511 01 600 WSOSHANLON
FIRAJIR OBSC TS FCST SHANLON FIRIUIR CNL SIGMET 2 10 12001 1 0 1 600
S OF N54 TOP FL390 MOV E WKN
AIRMET Cancellation of AIRMET
YUDD AIRMET 1 VALID 15 15201 15 1 800 WSO- YUDD AIRMET 2 VALID 15 165011 51 800 WSOSHANLON
FIR ISOL TS OBS SHANLON FIR CNL AIRMET 1 1515201151800
N OF S50 TOP ABV FL 100 STNR WKN
Example A6-2. SIGMET message for tropical cyclone
7
WCC SIGMET 3 VALID 25 16001252200 WDOAMSWELL
FIR TC GLORIA OBSN2706 W07306 AT 16002 CB TOP FL500 W1 150NM OF CENTRE MOV NW 1 OKT
NC FCST 22002 TC CENTRE N2740 W07345 OTLK TC CENTRE 260400 N2830 W07430 261000 N2912 W07530
Meaning:
The third SIGMET message issued for the AM SWELL*.^^^^^^ information region (identified by WCC Amswell area
control centre) by the ~onlon/International*m eteorological watch office (YUDO) since 0001 UTC; the message is valid
fiom 1600 UTC to 2200 UTC on the 25th of the month; tropical cyclone Gloria was observed at 27 degrees 06 minutes
north and 73 degrees 6 minutes west at 1600 UTC with cumulonimbus top at flight level 500 within 150 nautical miles
of the centre; the tropical cyclone is expected to move northwestwards at 10 knots and not to undergo any changes in
intensity; the forecast position of the centre of the tropical cyclone at 2200 UTC is expected to be at 27 degrees 40 minutes
north and 73 degrees 45 minutes west.
Outlook:
The centre of the tropical cyclone is expected to be on the 26th of the month at 0400 UTC. and 1000 UTC located at 28
degrees 30 minutes north and 74 degrees 30 minutes west, and at 29 degrees 12 minutes north and 75 degrees 30 minutes
west, respectively.
Fictitious locations
Appendix 6 Annex 3 - Meteorological Service for International Air Navigation
Example A6-3. SIGMET message for volcanic ash
YUDD SIGMET 2 VALID 21 1100/211700 YUSOSHANLON
FIRNIR VA ERUPTION MT ASHVAL LOC S1500 E07348 VA CLD OBS AT 11002 FL3101450 APRX
220KM BY 35KM S1500 E07348 - S 1530 E07642 MOV ESE 65KMH FCST 17002 VA CLD APRX S1506 E07500 -
S1518 E08112 - S1712 E08330 - S1824 E07836
OTLK 212300Z VA CLD APRX S1600 E07806 - S1642 E08412 - S1824 E08900 - S1906 E08100 2205002 VA CLD APRX
S1700 E08100 - S1812 E08636 - S2000 E09224 - S2130 E08418
Meaning:
The second SIGMET message issued for the SHANLON* flight information region (identified by YUDD Shanlon area
control centre) by the Shanlon.Intemational* meteorological watch oflice (YUSO) since 0001 UTC; the message is valid
from 1100 UTC to 1700 UTC on the 21st of the month; volcanic ash eruption of Mount Ashval* located at 15 degrees
south and 73 degrees 48 minutes east; volcanic ash cloud observed at 1100 UTC between flight Ievels 310 and 450 in an
approximate area of 220 km by 35 km between 15 degrees south and 73 degrees 48 minutes east, and 15 degrees
30 minutes south and 76 degrees 42 minutes east; the volcanic ash cloud is expected to move east-southeastwards at
65 kilometres per hour; at 1700 UTC the volcanic ash cloud is forecast to be located approximately in an area bounded
by the following points: 15 degrees 6 minutes south and 75 degrees east, 15 degrees 18 minutes south and 81 degrees
12 minutes south, 17 degrees 12 minutes south and 83 degrees 30 minutes east, and 18 degrees 24 minutes south and
78 degrees 36 minutes east.
Outlook:
The volcanic ash cloud at 2300 UTC on the 21st of the month is expected to be located approximately in an area bounded
by the following points: 16 degrees south and 78 degrees 6 minutes east, 16 degrees 42 minutes south and 84 degrees
12 minutes east, 18 degrees 24 minutes south and 89 degrees east, and 19 degrees 6 minutes south and 81 degrees east;
the volcanic ash cloud at 0500 UTC on the 22nd of the month is expected to be located approximately in an area bounded
by the following points: 17 degrees south and 81 degrees east, 18 degrees 12 minutes south and 86 degrees 36 minutes
east, 20 degrees south and 92 degrees 24 minutes east, and 21 degrees 30 minutes south and 84 degrees 18 minutes east.
Fictitious locations
Example A6-4. SIGMET message for severe turbulence
WCC SIGMET 5 VALID 22 12 151221 600 WDOAMSWELL
FIR SEV TURB OBS AT 12102 WSB FL250 MOV E 40KMH WKN
Meaning:
The fifth SIGMET message issued for the AMSWELL* flight information region (identified by YUCC Amswell area
control centre) by the Donlon/International* meteorological watch office (YUDO) since 0001 UTC; the message is valid
from 1215 UTC to 1600 UTC on the 22nd of the month; severe turbulence was observed at 1210 UTC over SibyBistock*
aerodrome (WSB) at flight level 250; the turbulence is expected to move eastwards at 40 kilometres per hour and to
　
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