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WSAU21 for SIGMET for other phenomena.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
WMO indicator of the MWO originating office:
Adelaide RFC APRM Perth FRC APRF
Brisbane RFC ABRF Sydney RFC ASRF
Darwin RFC ADRM Canberra MO ASRF
Hobart RFC AMHF Townsville MO ABTL
Melbourne RFC AMRF Melbourne AWC AMMC
Note: This differs from ICAO Australian location indicators used
elsewhere in the message which begin with “Y”.
Date/Time The issuing date and time UTC.
YXXX Indicates the Flight Information Centre (FIC) serving
the FIR.
YMMM indicates Melbourne, YBBB Brisbane.
SIGMET Standard identifier.
Daily Sequence Number:
contains two letters to indicate the location of the
event, followed by two–digit number, which indicates
the number of SIGMET issued within the FIRs
(Brisbane or Melbourne) since 0000 UTC. The two
letters location designators corresponding to their
Area of responsibility are as follows:
Adelaide RFC AD Perth FRC PH
Brisbane RFC BN Sydney RFC SY
Darwin RFC DN** Canberra MO CB
Hobart RFC HB Townsville MO TL
Melbourne RFC ML Melbourne AWC High Level*
* SIGMET for high level CAT, high level icing (above FL185) over
the Australian FIRs are issued by the Aviation Weather Centre
(AWC) Melbourne.
** SIGMET for Volcanic Ash over the Australian FIRs is the
responsibility of the BoM’s Volcanic Ash Advisory Centre
(VACC) Darwin .
To help recipients identify the air routes affected, the SIGMET
number contains two letters to indicate the location of the event.
The letters indicate the following:
BT the event is in the Brisbane FIR north of 30° south.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
BS the event is in the Brisbane FIR south of 30° south.
BB the event is in the Brisbane FIR and extends across 30°
south.
MW the event is in the Melbourne FIR west of 130° east.
ME the event is in the Melbourne FIR east of 130° east.
MM the event is in the Melbourne FIR and extends across 130°
  east.
The areas covered by the above location indicators are shown in
the following diagram:
VALID The word VALID is followed by the period of
validity – date and time UTC.
Location ICAO location indicator of the MWO office originating
the message.
FIR FIR indicator – either MELBOURNE FIR or
BRISBANE FIR.
Message The SIGMET details – description of the
phenomenon.
Message The SIGMET details – description about the
phenomenon.
Status ‘STS:’ meaning Status of SIGMET, followed by:
NEW meaning a New SIGMET,
REV meaning a Reviewed SIGMET, or
CNL meaning Cancellation of SIGMET.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
5.2.2 Example of high level CAT SIGMET:
WSAU21 AMMC 100030
YMMM SIGMET MM03 VALID 100800/101400 YMMC–
MELBOURNE FIR SEV CAT FCST WITHIN 100NM OF LINE
S3000 E11800 S3330 E13430 S3600 E16000 BTN FL 300/420
INTST NC
STS: REV MM02 100200/100800
WSAU21 AMMC 052245
YBBB SIGMET BT04 VALID 062300/070300 YMMC–
BRISBANE FIR
STS: CNL SIGMET BT03 052245/070300
Example of low level dust storm SIGMET:
WSAU21 APRM 052100
YMMM SIGMET AD01 VALID 052200/060200 YPRM–
MELBOURNE FIR HEAVY DUSTSTORMS TO A050
OBSERVED WITHIN AREA YBHI YOOM YLEC YBHI MOV SE
20KT INTST NC
STS: NEW
5.3 AIRMET
5.3.1 AIRMET information concerns the occurrence or expected
occurrence affecting the levels below FL120 in an area over which
meteorological watch is being maintained, of one or more of the
following phenomena:
a. hail;
b. moderate icing;
c. moderate turbulence, when this is expected to occur in an area,
or at a time, where or when it is not a normal seasonal feature;
d. the initial onset of phenomena producing extensive areas of
visibility of less than 8KM, or of cloud coverage of BKN or OVC
below 1,500FT above ground level;
e. winds of 40KT or more within 2,000FT above ground level;
and also includes phenomena covered by SIGMET advices.
Note: When SIGMET phenomena only are concerned, a separate
AIRMET advice is not issued.
5.3.2 AIRMET information, which concerns phenomena of a lesser
degree of severity than SIGMET information, is given to aircraft
operating at or below 10,000FT.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
5.3.3 AIRMET information is issued by MET forecasters and addressed
by ATS as a Hazard Alert to aircraft operating on routes or in areas
　
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