awp sigmet
TRANSCRIPT
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>BUREAU OF METEOROLOGY>WEATHER SERVICES
>AVIATION
AVIATION WEATHER PRODUCTS
SIGMET
SIGMET
A SIGMET is a warning issued to provide urgent advice to aircrat o the actual or expected
occurrence, in areas over which meteorological watch is being maintained, o weather
phenomena that are potentially hazardous. A SIGMET will contain inormation on one o the
ollowing phenomena:
Code Description
OBSC TS Obscured thunderstorms
EMBD TS Embedded thunderstorms
FRQ TS Frequent thunderstorms
SQL TS Squall line thunderstorms
OBSC TSGR Obscured thunderstorms with hail
EMBD TSGR Embedded thunderstorms with hail
FRQ TSGR Frequent thunderstorms with hail
SQL TSGR Squall line thunderstorms with hail
TC Tropical cyclone
SEV TURB Severe turbulence
SEV ICE Severe icing
SEV ICE FZRA Severe icing due to freezing rain
SEV MTW Severe mountain wave
HVY DS Heavy duststorm
HVY SS Heavy sandstorm
VA Volcanic ash
RDOACT CLD Radioactive cloud
A SIGMET will provide inormation on the location, extent, intensity and expected evolution
o the specifed phenomenon.
SIGMETs or thunderstorms are only issued when they are:
obscured(OBSC)byhazeorsmoke
embedded(EMBD)withincloudlayers
frequent(FRQ),i.e.withlittleornoseparationbetweencloudsandcoveringmorethan
75% o the area aected
squallline(SQL)thunderstormsalongalineofabout100nauticalmilesormoreinlength,
with little or no separation between clouds
SIGMETforthunderstormsdonotincludereferencetocumulonimbuscloud(CB)or
associated icing and turbulence as these are implied as occurring.
Pilots in command o
aircrat encountering
any phenomenon in
this table not notifed
by SIGMET must
report details o the
phenomenon in anAIREP SPECIAL
FURTHER INFORMATIONAviation Weather Services
Visit us at www.bom.gov.au
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SIGMET or tropical cyclones include cumulonimbus but not associated icing and turbulence
as these are implied as occurring.
Responsibility for the issuance of SIGMET within
the Australian Flight Information Regions
SIGMETsforvolcanicasharetheresponsibilityoftheVolcanicAshAdvisoryCentre,Darwin.
SIGMETsfortropicalcyclonesaretheresponsibilityoftheTropicalCycloneWarningCentres
inPerth,DarwinandBrisbane.
SIGMETsforturbulenceandicingaboveFL185aretheresponsibilityoftheAviationWeather
Centre,Melbourne.
SIGMETforallotherphenomenaaretheresponsibilityoftheMeteorologicalWatchOfces
locatedinPerth,Darwin,Adelaide,Hobart,Melbourne,SydneyandBrisbane.
SIGMET Structure
Bulletin Identifcation
WCAU01forSIGMETfortropicalcyclones
WVAU01forSIGMETforvolcanicashcloud
WSAU21forSIGMETforotherphenomena
Originating Ofce (WMO Location Indicator)
TheWorldMeteorologicalOrganisation(WMO)locationindicatorsforAustralian
MeteorologicalWatchOfcesare:
APRM Adelaide
APRF Perth
ABRF Brisbane
ASRF Sydney
ADRM Darwin
AMRF Melbourne
AMHF Hobart
AMMC AviationWeatherCentreMelbourne
Note:ThesedifferfromtheICAOindicators
(beginningwithY)usedelsewhereinthemessage.
WSAU21AMMC180357
YMMMSIGMETMM01VALID180439/180839YMMC-
YMMMMELBOURNEFIRSEV
TURBFCSTWIS3200E12800-
S3200E13000-S4700E13600
-S4700E13400FL260/400
MOVE25KTNC
STS:NEW
WVAU01ADRM200100
YBBBSIGMETBT04VALID
200100/200700YPDM-
YBBBBRISBANEFIRVA
ERUPTIONLOCS0416E15212
VACLDOBSAT200100Z
A100/180APRX120NMBY
40NMS1130E14530-S1330
E14900-S1030E15030
-S0830E14700-S1130
E14430MOVSW20KTFCST0700ZVACLDAPRXS110
E144530-S1230E14930
-S1050E15130-S0800
E14700-S1130E14400
STS:REVSIGMETBT03
191900/200100
WCAU01APRF180217
YMMMSIGMETPH01VALID
180215/180815YPRF-
YMMMMELBOURNEFIRTC
ILSAOBSAT0000ZS1330
E11324CBTOPFL500WI
120NMOF
CENTREMOVWSW17KT
INTSFFCST0815ZTCCENTRE
S1418E11036
STS:NEW
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Issue Date/Time
Issuedate/timeisgiveninUTCintheformDDHHMM,whereDDisdayofmonth,and
HHMMistimeinhoursandminutes.
Flight Inormation Region
GivestheabbreviationfortheFIR(YMMMorYBBB)inwhichthephenomenonislocated.
Identifer
The message identifer is SIGMET.
Daily Sequence Number
Thefour-charactersequencenumberconsistsof:
atwo-letterdesignatortoindicatethegenerallocationoftheevent(asgiveninthetwo
mapsbelow),and
atwo-digitnumber,givingthesequencenumberofSIGMETsissuedbytherelevantofce,
withinthegivenFIR(BrisbaneorMelbourne)since0000UTC.
Thetwo-letterdesignators,andtheirassociatedgeographicalextent,forlow-level(below
FL185)SIGMETincludingtropicalcyclonesare:
Thetwo-letterdesignators,andtheirgeneralassociatedgeographicalextent,forvolcanic
ashandhigh-level(aboveFL185)icingandturbulenceSIGMETare:
A Altitude
ABV Above
APRX Approximately
BLW Below
CLD Cloud
CNL CancelDS Dust storm
E East or easternlongitude
EMBD Embedded
FCST Forecast
FIR Flight InformationRegion
FL Flight level
FRQ Frequent
FZRA Freezing rain
GR Hail
HVY Heavy
ICE Icing
INTSF Intensifying
KT Knots
LOC Location
MOV Moving
MT Mount
N North or northernlatitude
NC No Change (inintensity)
NM Nautical MilesOBS Observed
OBSC Obscured
RDOACTCLD
Radioactive cloud
REV Review
S South or southernlatitude
SEV Severe
SQL Squall line
SS Sand storm
STNR Stationary
STS Status
TC Tropical cyclone
TOP Cloud Top
TS Thunderstorm
TURB Turbulence
VA Volcanic ash
W West or westernlongitude
WI Within (area)
WKN Weakening(intensity)
Z Code for UTC(Universal TimeCoordinated)
SIGMET Abbreviations
MELBOURNE FIR
BRISBANE FIR
PH
BN
AD
ML
DN
SY
HB
160E
160E
150E
150E
140E
140E
130E
130E
120E
120E
110E
110E
100E
100E
90E
90E
80E
80E
0 0
10S 10S
20S 20S
30S 30S
40S 40S
50S 50S
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Originating Ofce (ICAO Location Indicator)
TheInternationalCivilAviationOrganization(ICAO)locationindicatorsforAustralian
MeteorologicalWatchOfcesare:
YPRM Adelaide
YPRM Perth
YBRF Brisbane
YSRF Sydney
YPDM Darwin
YMRF Melbourne
YMHF Hobart
YMMC AviationWeatherCentreMelbourne
Flight Inormation Region
ThisgivestheabbreviationandfullnamefortheFIRinwhichthephenomenonislocated.
Meteorological Inormation
This section includes:
typeofphenomenon
observedorforecast
location,bothhorizontalandverticalextent
movementorexpectedmovement
expectedchangeinintensity
forecastpositionattheendofthevalidityperiod(onlyinSIGMETforTCandVA)
The frst point o a polygon is not repeated when describing the horizontal extent o an event.
SIGMETfortropicalcyclonesdonotincludereferencetocumulonimbuscloud(CB)or
associated icing and turbulence as these are implied as occurring.
Cancel SIGMET
I during the validity period o a SIGMET, the phenomenon or which the SIGMET is no
longer occurring or is no longer expected, the SIGMET is cancelled by issuing a SIGMET with
theabbreviationCNLinlieuofmeteorologicalinformation.CNLisalsoincludedonthe
status line.
SIGMET Status
The status line indicates whether the SIGMET is:
NEW-theSIGMETisforanewphenomenon.
REV-theSIGMETreviewsanearlierSIGMETforthephenomenon.
CNL-theSIGMETcancelsacurrentSIGMET.
WSAU21AMMC180720
YMMMSIGMETMM02VALID
180720/180839YMMC-
YMMMMELBOURNE
FIRCNLSIGMETMM01
180439/180839
STS:CNLSIGMETMM01
180439/180839
Airservices Australia is the ocial distributor o aviation orecasts, warnings and observations issued
by the Bureau o Meteorology. Airservices fight brieng services are available at
www.airservicesaustralia.com. Telephone contact details or elaborative briengs are contained in
Airservices Aeronautical Inormation Publication Australia (AIP), which is available online through
their website.
Other brochures produced by the Bureau o Meteorologys aviation weather services program can be
ound at www.bom.gov.au/aviation/knowledge-centre.
CommonwealthofAustralia,17May2012