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Seminar onAeronautical Meteorology Services in Asia
Beijing, China11 – 15 April 2011
How to use SIGMET advisory
Sheng LiGuangzhou Regional Meteorological Center, Central & Southern Air Traffic Management
Bureau, Guangzhou, China
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Contents
1、Outline of SIGMET advisory
2、How to use SIGMET advisory
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Outline of SIGMET advisory
What is SIGMET advisoryWeather PhenomenaVertical CoverageFormat Issue Frequency Validity PeriodDissemination
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What is SIGMET advisory?
The SIGMET advisory is supposed to “trigger” a reaction from the MWO (if needed) and in any case to help the MWO with the issuance of the best possible SIGMET
The SIGMET advisory can be regarded as a guidance.
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Weather Phenomenaa) thunderstorms:
1) obscured (OBSC TS), with hail (OBSC TSGR);2) embedded (EMBD TS), with hail (EMBD TSGR);3) frequent (FRQ TS), with hail (FRQ TSGR);4) squall line (SQL TS), with hail (SQL TSGR);
b) severe turbulence: (SEV TURB)
c) severe icing :(SEV ICE), due to freezing rain (SEV ICE (FZRA))
d) severe mountain wave:(SEV MTW)
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Vertical CoverageSIGMET advisory were to be issued for
these 4 types of phenomena which are occurring above 10,000 feet (> FL100). For those phenomena that occurred through this level, a lower limit of the phenomena should still be estimated.
FL080
FL040
FL130
FL040
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Format(1)
The format for the SIGMET advisory during the trial will be both textual and graphical.the textual version of SIGMET advisory is abbreviated to SMA,the Graphical version is abbreviated to SMG
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FORMAT(2)SMA :during the trial ,SMA will be issued for
each phenomenon, as required, (It’s format is similar to current practice with tropical cyclone advisories (TC) and volcanic ash advisories
(VA)
SMG :during the trial,SMG will consist of advisory areas for all concerned phenomena in a single chart.
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SMA Format details(1)Element Detailed
contentTemplate Examples
1 WMO header
FRnnnn nnnn nnnnnn FRAS?? ZBBB 090400
2 Identificati-on of the type of message
Type of message and sequence number
SMA nnn SMA 001SMA 002SMA 003
3 Time of origin
Year,mon-th,day,time in UTC of issue
ISSUED:nnnnnnnn/nnnnZ
ISSUED :20110509/0400Z
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SMA Format details(2)
element Detailed content
template examples
4 Name of SAC
Name of SIGMET Aviosory Center
SAC:nn [n…] n SAC:ASIA
5 Validity period
Day-time groups indicating the period of validity in UTC
DTG:nnnnnn/nnnnnn DTG:090400/091000DTG:090600/091000
If there is no phenomenon that meet the critera expected to occur during the validity period,the SMA from here will jump to item 13(see item 13)
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SMA Format details(3)Element Detailed
contentTemplate Examples
6 FIR ICAO location indicator of the FIR/s in which the phenomenon occurred
FIR:nnnn [/nnnn] [/nnnn]/
FIR:VNSM/ZPKM
7 Phenom-enon
Description of the phenomenon
PHENOMENON:OBSC TS[GR] orFRQ TS[GR]orSEV TURB orSEV ICE orSEV MTW
PHENOMENON:OBSC TSPHENOMENON:OBSC TSGRPHENOMENON:FRQ TSPHENOMENON:OBSC TSGRPHENOMENON:SEV ICEPHENOMENON:SEV TURBPHENOMENON:SEV MTW
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SMA Format details(4)Element
Detailed content Template Examples
8 Forecast Indication whetherthe information isobserved andexpected to continue,or forecast
FCSTOBS
OBSOBS AT 1210ZFCST
9 Locati-on
Location(referring to latitude/longitudeIn degrees and minutes)
LOCATION:WI Nnnnn Ennnnn-Nnnnn Ennnnn-Nnnnn Ennnnn-Nnnnn Ennnnn-Nnnnn Ennnnn
LOCATION:WI N2330 E11324-N2054 E10948-N2130 E11036
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SMA Format details(5)Element Detailed content Template Examples
10 Level Flight level and extent
LEVEL:FLnnn orFLnnn/nnn orTOP FLnnn orTOP ABV FLnnn
LEVEL:FL180LEVEL:FL180/300LEVEL:TOP FL400LEVEL:TOP ABV FL390LEVEL:FL060/180
11 Movement Movement or expected movement(direction and speed) with reference to one of the sixteen points of the compass,or staionary
MOVEMENT:N [nnKMH]orSSE[nnKMH] or
STNR
MOVEMENT:N 30KMHMOVEMENT:SSE 25KMHMOVEMENT:STNR
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SMA Format details(6)Element Detailed
contentTemplate Examples
12 Changes in intensity
Expected changes in intensity
INTENSITY:INTSF or WKN or NC
INTENSITY:INTSFINTENSITY:WKNINTENSITY:NC
13 Remarks Remarks as necessary
RMK:nn[n…]n RMK: NO PHENOMENA EXPECTED TO OCCUR IN THE REGION
14 Next SMA issue time
When the next gourp of SMA will be issued
NXT ADVISORY: nnnnnnnn/nnnnZ
NEXT ADVISORY:20110509/0800Z
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FRAS?? ZBBB 090400SMA 005ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:EMBD TSFCSTFIR:VVTS/VLVT/VDPPLOCATION:WI N1826 E10547-N1155 E10923-
N1355 E10345 LEVEL:TOP ABV FL390MOVEMENT:N 30KMHINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
SMA EXAMPLE ①
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SMA EXAMPLE ②:FRAS?? ZBBB 090800SMA 009ISSUED :20110509/0800ZSAC:BEIJINGVALID:090800/091400RMK: NO PHENOMENON EXPECTED
TO OCCUR IN THE REGION NEXT ADVISORY:20110509/1200Z
Regional Seminar on Aeronautical Meteorological Services in Asia
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In the SMG,we use different colours to describe different phenomena.
Red:TS(all types)
Green:SEV TURB
YELLOW:SEV MTW
gSMGCENTER:BEIJING ISSUED:20110509/0400Z
NEXT SMG:20110509/0800Z
NR VALID PHENOMENON LEVEL MOVMENT INTENSITY
001 090500/090800 EMBD TS FCST TOP ABV FL450 SSE 30KMH NC
002 090400/091000 FRQ TS FCST FL030/400 E 25KMH INTSF
003 090400/091000 SEV TURB FCST FL260/400 S 40KMH NC
004 090400/091000 SEV TURB FCST FL200/390 E 30KMH WKN
005 090400/091000 SEV ICE FCST FL080/160 STNR NC
006 090400/091000 SEV MTW FL120/200 STNR NC
001006
004
005
GRAPHICAL SIGMET ADVISORY(SMG)
EXAMPLE
BLUE:SEV ICE
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FRAS?? ZBBB 090400SMA 005ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:EMBD TSFCSTFIR:VVTS/VLVT/VDPPLOCATION:WI N1826 E10547-N1155 E10923-N1355 E10345 LEVEL:TOP ABV FL390MOVEMENT:N 30KMHINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
gSMGCENTER:BEIJING ISSUED:20110509/0400Z
NEXT SMG:20110509/0800Z
NR VALID PHENOMENON
LEVEL MOVMENT
INTENSITY
005 090400/091000
EMBD TS FCST
TOP ABV FL390
N 30 KMH
NC
GRAPHICAL SIGMET ADVISORY(SMG)
EXAMPLE
Regional Seminar on Aeronautical Meteorological Services in Asia
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Contrast between SMA and SMGSMA SMG
Phenomena Each SMA will describe only
onephenomenon
Each SMG can describe multiple
phenomena
Location coordinates Polygons on the chart
Issuance At least 1 SMA at each issued time
1 SMG at each issued time
Cancellation Replaced byUpdating the Current SMA
Replaced byUpdating the Current SMG
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Issue Frequency(1)
During the trial,the update frequency will be no greater than 4 hours.The fixed issued time will be 00/04/08/12/16/20 UTCeach day.The SIGMET advisory we issued will be kept under continuous review,if there will be significant difference form what we have expected between two fixed issued time,We will issued a update SIGMET advisory for the current one.
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Issue Frequency(2)
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Issue Frequency(3)
What about other phenoamena with the same validity period that are expected to have no significant difference compared with the current SIGMET advisory?
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Issue Frequency(4)ISSUED:04UTC ISSUED:06UTC
VALID:04/10UTC VALID:06/10UTC
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Validity Period
The validity period for the SIGMET adivosry during the trial will be for a period up to 6 hours. This would allow MWOs responsible for the issuance of SIGMET (up to 4 hours validity) to have sufficient lead time to prepare and disseminate the relevant SIGMET.
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FRAS?? ZBBB 090400SMA 005ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:EMBD TSFCSTFIR:VVTS/VLVT/VDPPLOCATION:WI N1826 E10547-N1155 E10923-
N1355 E10345 LEVEL:TOP ABV FL390MOVEMENT:N 30KMHINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
SMA EXAMPLE ①: Fixed time
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FRAS?? ZBBB 090400SMA 006ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:SEV TURBFCSTFIR:ZHWH/ZSHALOCATION:WIN3243 E10950-N3039 E12190-N2658 E11953-N2754 E10938LEVEL:FL270/FL340MOVEMENT:STNRINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
SMA EXAMPLE ①: Fixed time (continued)
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FRAS?? ZBBB 090400SMA 005ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:EMBD TSFCSTFIR:VVTS/VLVT/VDPPLOCATION:WI N1826 E10547-N1155 E10923-
N1355 E10345 LEVEL:TOP ABV FL390MOVEMENT:N 30KMHINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
0600
0600Z
FRQ TS0600
INTSF
007 SMA EXAMPLE ②:Update
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FRAS?? ZBBB 090400SMA 006ISSUED :20110509/0400ZSAC:BEIJINGVALID:090400/091000PHENOMENON:SEV TURBFCSTFIR:ZHWH/ZSHALOCATION:WIN3243 E10950-N3039 E12190-N2658 E11953-N2754 E10938LEVEL:FL270/FL340MOVEMENT:STNRINTENSITY:NCRMK:NILNEXT ADVISORY:20110509/0800Z
0600
0600Z
0600
008 SMA EXAMPLE ②:Update
(continued)
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Dessemination
Dissemination for the SIGMET advisory during the trial will be via AFTN and the internet.
SMA:via the internet/AFTNSMG:via the internet
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The Internet accessVisit the Asian Aeronautical Meteorology
Service website:WWW.AAMETS.ORG
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How to use SIGMET advisory
SIGMET advisory is just a guidance for SIGMET issuance. It is not going to take the place of SIGMET.It provide a direct reference product for MWOs forecasters.
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Use SMA as a guidancefor SIGMET issuance
FRAS?? ZBBB 120400 SMA 004 ISSUED :20110412/0400Z SAC:BEIJING VALID:120400/121000 PHENOMENON:EMBD TS FCST FIR:ZYSH/VLVT/VTBB/ LOCATION:WI N1603 E11130 -S1432 E11425-N0958 E10634 -N0847 E10152-N1341 E09931 -N1907 E10152-N1841 E10432 - N1649 E10559 LEVEL:TOP ABV FL390 MOVEMENT:STNR INTENSITY:NC RMK:NIL NEXT ADVISORY:20110412/0800Z
2011.4.12 03UTC
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SMGCENTER:BEIJING ISSUED:20110412/0400Z
NEXT SMG:20110412/0800Z
NR VALID PHENOMENON LEVEL MOVMENT INTENSITY
004 120400/121000 EMBD TS FCST TOP ABV FL390
STNR WKN
004
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Use SMA as a guidance for SIGMET issuance
The SIGMET issued by Haikou MWO may be:ZJHK SIGMET 1 VALID 120500/120900 ZJSA-ZJSY SANYA FIREMBD TS S OF N16 TOP ABV FL390 STNR NC=
N16
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Keys to use SIGMET advisory FRAS?? ZBBB 060800 SMA 004 ISSUED :20110606/0800Z SAC:BEIJING VALID:060800/061300 PHENOMENON:EMBD TS FCST FIR:ZYSH/VLVT/VTBB/ LOCATION:WI N1603 E11130 -S1432 E11425-N0958 E10634 -N0847 E10152-N1341 E09931 -N1907 E10152-N1841 E10432 - N1649 E10559 LEVEL:TOP ABV FL390 MOVEMENT:STNR INTENSITY:WKN RMK:NIL NEXT
ADVISORY:20110606/1200Z
Always use the latest advisoryEven the validity period of the
Previous advisory is still avaible
Whether the phenomena is goingTo occur in your
FIR region
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22/0730UTCAnother example
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(14UTC)
22/08UTC
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(15UTC)
22/09UTC
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo
22/10UTC
6hr Precipitation(16UTC)
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(17UTC)
22/11UTC
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo
22/12UTC
6hr Precipitation(18UTC)
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(19UTC)
22/13UTC
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500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(20UTC)
22/14UTC
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22/0730UTCAnother example
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SMGCENTER:BEIJING ISSUED:2011032/0800Z
NEXT SMG:20110322/1200Z
NR VALID PHENOMENON LEVEL MOVMENT INTENSITY
004 220800/221400 EMBD TS FCST TOP ABV FL390 WNW 20KMH INTSF
005 220800/221400 SEV TURB FCST FL200/FL290 E 30KMH NC
005
004
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FXAS?? ZBBB 220800SMA 004ISSUED :20110322/0800ZSAC:BEIJINGVALID:220800/221400PHENOMENON:EMBD TSFCSTFIR:VDPP/VLVT/VTBB/VVTSLOCATION:WI N1641 E10401-N1557 E10756-N1412 E10916-N1137 E10852-N0923 E10601-N0731 E09943-N1247E09939LEVEL:TOP ABV FL390MOVEMENT:MOV WNW 20KMHINTENSITY:INTSFRMK:NILNEXT ADVISORY:20110322/1200Z
FRAS?? ZBBB 220800SMA 005ISSUED :20110322/0800ZSAC:BEIJINGVALID:220800/221400PHENOMENON:SEV TURBFCSTFIR:ZPKM /ZHWH /ZSHA LOCATION:WI N3100 E10533-S2938 E10922-N3012 E11318-N3108 E11623-N3214 E11251-N3210 E10929LEVEL:FL200/290MOVEMENT:MOV E 30KMHINTENSITY:NCRMK:NILNEXT ADVISORY:20110322/1200Z
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22/0830UTC
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22/0930UTC
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22/1030UTC
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22/1130UTC
next SIGMET advisoryWould issue 30mins
Later.This area may beCutted in thenext advisory
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22/1230UTC
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22/1330UTC
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22/1430UTC
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THANK YOU!