afi met bulletins exchange (ambex) handbook - ICAO

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AFI Regional SIGMET Guide Page12/60 3.4.2 First line of SIGMET CCCC SIGMET [nn]n VALID YYGGgg/YYGGgg CCCC- 3.4.2.1 The meaning of the groups in the first line of the SIGMET is as follows: CCCC ICAO location indicator of the ATS unit serving the FIR or CTA to which the SIGMET refers SIGMET Message identifier [nn]n Daily sequence number (see p.3.4.2.2) VALID Period of validity indicator YYGGgg/YYGGgg Validity period of the SIGMET given by date/time group of the beginning and date/time group of the end of the period (see p.3.4.2.3) CCCC ICAO location indicator of the issuing MWO - hyphen to separate the preamble from the text 3.4.2.2 The numbering of SIGMETs starts every day at 0001 UTC. The sequence number should consist of up to three symbols and may be a combination of letters and numbers, such as: - 1, 2, … - 01, 02, … - A01, A02, … Examples: GOOO SIGMET 2 VALID 121100/121700 GOOY- DGACSIGMET A04 VALID 202230/210430 DGAA- Note 1: No other combinations should be used, like “CHARLIE 05” or “NR7”. Note 2: Correct numbering of SIGMET is very important since the number is used for reference in communication between ATC and pilots and in VOLMET and D-VOLMET. 3.4.2.3 The following considerations should be taken into account when determining the validity period: - The period of validity of a WS SIGMET should not be more than 4 hours; - The period of validity of a WC or WV SIGMET should not be more than 6 hours; - In case of a SIGMET for an observed phenomenon, the filing time (date/time group in the WMO header) should be the same or very close to the time in the date/time group indicating the start of the SIGMET validity period; - When the SIGMET is issued for a forecast phenomenon: o the beginning of validity period should be the time of the expected commencement (occurrence) of the phenomenon in the MWO area of responsibility; o the time of issuance of the SIGMET should not be more than 4 hours before the start of validity period (i.e., expected time of occurrence of the phenomenon); for TC and VA SIGMET the lead time should be up to 12 hours. 3.4.2.4 The period of validity is that period during which the SIGMET information is valid for transmission to aircraft in flight. September 2007 Amend1/2010 Ninth Edition
AFI Regional SIGMET Guide Page 13/60 Examples: 1. SIGMET for an observed phenomenon: WSNI31 DNKN241120 DNKKSIGMET 3 VALID 241120/241500 DNKN- 2. SIGMET for a forecast phenomenon (expected time of occurrence 1530) WSCG31 FCBB 311130 FCBBSIGMET 1 VALID 1530/1930 FCCC- 3.4.3 Format of the meteorological part of SIGMET messages for weather phenomena other than TC and VA 3.4.3.1 The meteorological part of a SIGMET for weather phenomena consists of seven elements as shown in the table below. Start of the second line of the message 1 2 3 4 5 Name of the FIR/UIR or CTA FIR [CTA] Description of the phenomenon OBS [AT Z] FCST OBS [AT Z] AND FCST 6 7 Movement or expected Changes in intensity movement MOV KMH[KT] or STNR 3.4.3.1.1 Name of the FIR/UIR or CTA(Column 1) CCCC FIR[/UIR] or CCCC CTA Observed or forecast Location Level Geographical location of the phenomenon given by coordinates, or geographical objects, or location indicators FL or FL or [TOP [ABV or BLW]] FL The ICAO location indicator and the name of the FIR/CTA is given followed by the appropriate abbreviation: FIR, FIR/UIR or CTA. Examples: September 2007 Amend1/2010 Ninth Edition
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Appendix A -List of Participants N
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19 Sougue Bissa Chargé d’Activit
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Conc/Dec No. Title of Conclusion/ D
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MET/SG/10 Report - Appendix C INTER
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AMBEX HANDBOOK 7th Ed. 3/58 Amendme
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AMBEX HANDBOOK 7th Ed. 5/58 8. META
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AMBEX HANDBOOK 7th Ed. 7/58 1. INTR
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ANNEX 1 - AFI MET/SG/10 Report - Ap
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MET/SG/10 Report - Appendix D AFI -
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ANNEX 1 - ASIA/PAC MET/SG/10 Report
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MET/SG/10 Report - Appendix D ASIA/
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MET/SG/10 Report - Appendix D Name
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MET/SG/10 Report - Appendix D CAR/S
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ICAO Location Indicator SA SP FC FT
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Appendix H SUMMARY OF OPERATIONAL S
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STAT E CAMEROON CAPE VERDE Requirem
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STATE CHAD COMOROS Requirements Ide
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STATE DJIBOUTI Requirements 1 Ident
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STATE THE GAMBIA Requirements Ident
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STATE GHANA GUINEA Requirements Ide
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STATE GUINEA BISSAU LESOTHO Require
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STATE LIBERIA Requirements Identifi
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STAT E MAURITANIA NIGER Requirement
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STA TE Requirements 1 Identificatio
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ETAT 1 SAO TOME SÉNÉGAL Besoins I
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ETAT 1 SIERRA LEONE SOMA LIA SWAZI
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APIRG/15-WP/13 27/06/05 24 EXPLANAT
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c) Review and update the AFI Volcan
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Page 2 of 29 Volcanic Ash Contingen
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3.6 Risk Tolerability Page 20 of 29
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No. HAZARD Descriptio n (additional
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F) SFC G) FL350) Page 26 of 29 Volc
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World area forecast system (WAFS) (
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Terms of Reference Appendix M: Term
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