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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
Contents
1、Outline of SIGMET advisory
2、How to use SIGMET advisory
Outline of SIGMET advisory
What is SIGMET advisoryWeather PhenomenaVertical CoverageFormat Issue Frequency Validity PeriodDissemination
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.
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)
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
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
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.
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
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)
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
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
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
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
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
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
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
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
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
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.
Issue Frequency(2)
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?
Issue Frequency(4)ISSUED:04UTC ISSUED:06UTC
VALID:04/10UTC VALID:06/10UTC
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.
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
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)
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
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)
Dessemination
Dissemination for the SIGMET advisory during the trial will be via AFTN and the internet.
SMA:via the internet/AFTNSMG:via the internet
The Internet accessVisit the Asian Aeronautical Meteorology
Service website:WWW.AAMETS.ORG
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.
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
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
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
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
22/0730UTCAnother example
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(14UTC)
22/08UTC
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(15UTC)
22/09UTC
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo
22/10UTC
6hr Precipitation(16UTC)
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(17UTC)
22/11UTC
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo
22/12UTC
6hr Precipitation(18UTC)
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(19UTC)
22/13UTC
500hPa
700hPa Vertical Speed
K IndexCAPE
Simulated Radar Echo 6hr Precipitation(20UTC)
22/14UTC
22/0730UTCAnother example
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
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
22/0830UTC
22/0930UTC
22/1030UTC
22/1130UTC
next SIGMET advisoryWould issue 30mins
Later.This area may beCutted in thenext advisory
22/1230UTC
22/1330UTC
22/1430UTC
THANK YOU!
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