afi met bulletins exchange (ambex) handbook - ICAO

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AMBEX HANDBOOK 7th Ed. 54/58 OPMET Data Elements Defining Control Methods METAR • AHL Software verification METAR COR • Code name SPECI • Observation date/time Manual validate (SA,SP) TAF TAF AMD TAF COR (FT,FC) SIGMET (WS, WC, WV) Volcanic Ash Advisory FV Tropical Cyclone Advisory FK • AHL • Code name • Originating station ICAO location indicator • Date/time of issue • Date, time of starting, time of end of the period the forecast refers to • AHL • SIGMET Sequence No • Date/time groups indicating the period of validity Additional Checks (recommended): • Name of the FIR or the CTA the message is issued for • Location indicator of the MWO originating the message • Type of message • • Issue date and time 2 OPMET Monitoring Additional Checks (recommended): • • Location indicator or name of the VAAC centre originating the message • Type of message • Issue date and time Additional Checks (recommended): • Location indicator or name of the TCAC centre originating the message 2.1 Monitoring of Scheduled OPMET data Periodic Quality Control & PI Monitoring Software verification Manual validate Periodic Quality Control & PI Monitoring Software verification Manual validate Periodic SIGMET Quality Control Monitoring Software verification Manual validate Periodic VA Quality Control Monitoring Software verification Manual validate Periodic TC Quality Control Monitoring 2.1.1 Performance Indicators (PIs). The indices to be used by the RODBs are based on those developed by the European BMG for monitoring the SADIS distribution (ref. SADISOPSG/8, IP/5 – SADIS OPMET Performance Indices). (i) Compliance Index The AMBEX Compliance index can be calculated from:
AMBEX HANDBOOK 7th Ed. 55/58 Vbul compliance = The Compliance Index is to assess the level of compliance to the AMBEX scheme. The determination of the compliance index is performed as follows: • Total number of reports received for AMBEX bulletin during the monitoring period, include reports in the retard bulletins. • Weed out correction and amendment bulletins, as these are re-transmitted messages, can be disregarded. (ii) Availability Index The availability index measures the current coverage of the OPMET distribution against the AMBEX exchange requirements. The determination of the availability index is performed on a daily basis from the data captured during the monitoring period. If at least one non-NIL report is received from the aerodrome during the 24-hour period, that aerodrome is considered to have been available. The daily availability index of a particular bulletin can be calculated as: Vbul availability = (iii) Regularity Index No of reports received for a bulletin No of reports required for the bulletin The regularity index measures the consistency in the number of reports provided by an aerodrome. The computation of Regularity Index assumes that the number of report follows a normal distribution and attempts to ascertain the distribution characteristics (mean and standard deviation) from a set of data. These characteristics are used to determine if subsequent number of reports from an aerodrome is “regular”. Denoting mean and standard deviation by μ and σ , a threshold report numbers (τ ) can be established as: τ = μ – σ The threshold is a reporting characteristic of an aerodrome. If the subsequent daily number of reports meets or exceeds the threshold, it is considered “regular”. The daily regularity index for a bulletin can be expressed as: Vbul regularity = No of aerodromes for which one or more non-NIL data type are received No of aerodromes required in the bulletins No of aerodromes for which the number of reports equals or exceeds the threshold No of aerodromes required in the bulletin 2.2 Monitoring of non-scheduled OPMET data
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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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Conc/Dec No. 13) APIRG Con. 14/42 1
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Conc/Dec No. 21) APIRG Con16/58 22)
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Conc/Dec No. 29) APIRG/17 Concl. 17
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MET/SG/10 Report - Appendix C INTER
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MET/SG/10 Report - Appendix D MID -
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MET/SG/10 Report - Appendix D NAM -
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ANNEX 1 - NAT MET/SG/10 Report - Ap
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ANNEX 2 - AFI MET/SG/10 Report - Ap
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ANNEX 2 - EUR MET/SG/10 Report - Ap
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MET/SG/10 Report - Appendix D State
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ANNEX 2 - CAR/SAM MET/SG/10 Report
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ANNEX 2 - NAM MET/SG/10 Report - Ap
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ANNEXE 3 MET/SG/10 Report - Appendi
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MET/SG/10 Report - APPENDIX E INTER
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AFIAFI Regional SIGMET Guide Page3/
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AFIRegional SIGMET Guide Page5/60 1
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AFI Regional SIGMET Guide Page 7/60
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AFI Regional SIGMET Guide Page22/60
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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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. Page 6 of 29 Volcanic Ash Conting
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Page 10 of 29 Volcanic Ash Continge
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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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