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magnetic degrees.
Remark: Local routine and special reports are used only for ATC purposes and ATIS broadcasts
supporting flight operations.
4.1.4.2 b) 2), e) In automated reports for Liepaja and Ventspils aerodromes (during non-operational hours of the
aerodromes), wind direction is reported as variable when the wind speed is 3 kt and less.
When for meteorological broadcasts at Liepaja and Ventspils aerodromes local routine and special
reports are used, wind speed of 99 kt or more is always reported as observed value.
Remark: Software modification is expected to be implemented by 2007.
4.2.4.4* In METAR, for Riga aerodrome the visibility value representative of the touchdown zone of a
runway in use is reported when automated equipment for the measurement of visibility is not used.
Remark: In this case priority is given to the concept of visibility more representative of areas of
concern to the safety of flight operations.
4 LATVIA SUPPLEMENT TO ANNEX 3 (FIFTEENTH EDITION)
* Recommended Practice
22/9/06
In reports for Liepaja and Ventspils aerodromes, the visibility value is derived from point of
measurement without directional variations measurements.
4.4.2.3* The following weather phenomena are not reported in the automated reports (during nonoperational
hours of the aerodromes): SG, PL, IC, GR, GS, SA, DU, FU, VA, PO, SQ, FC, DS
and SS.
Remark: At present, such information is not available from the automatic unmanned observing
system. The meteorological optical range (MOR) is the coding criterion used for the FG and BR
abbreviations.
4.4.2.4* The following characteristics of present weather phenomena are not reported in the automated
reports (during non-operational hours of the aerodromes): TS, SH, FZ, BL and DR.
4.4.2.5* The proximity indicator VC in the automated reports (during non-operations hours of the
aerodromes) is not included.
Remark: At present, such information is not available from the automatic unmanned observing
system. The meteorological optical range (MOR) is the coding criterion used for the FG and BR
abbreviations.
4.5.1* Cloud observations are made near one of the touchdown zones of the runway at Liepaja and
Ventspils aerodromes.
Remark: Observations are made by a stand-alone observation system. Compliance is expected by
2013.
4.8.1.2* At Riga aerodrome in local routine and special reports, moderate/severe turbulence,
moderate/severe icing and wind shear are reported as supplementary information.
No supplementary information is reported in the automated reports (during non-operational hours
of the aerodromes).
4.9.1.2* The abbreviation “NDV” in automated reports (during non-operational hours of aerodromes) is not
used.
Remark: Software modification is expected to be implemented by 2007.
4.9.1.3* The following types of present weather phenomena IC, DR (DU, SA, SN), BL (DU, SA, SN) TS,
SQ, VA and FC are not reported in automated reports (during non-operational hours of the
aerodromes) and the abbreviation “UP” is not used.
Remark: Software modification is expected to be implemented by 2007.
4.9.1.4* The reporting of missing cloud types using “///” and the abbreviation “NCD” in automated reports
(during non-operational hours of the aerodromes) is not used.
Remark: Software modification is expected to be implemented by 2007.
SUPPLEMENT TO ANNEX 3 (FIFTEENTH EDITION) LATVIA 5
* Recommended Practice
22/9/06
4.9.1.5* The abbreviation “REUP” in automated reports (during non-operational hours of the aerodromes)
is not used.
Remark: Software modification is expected to be implemented by 2007.
Table A3-2 The abbreviation “FZUP” in automated reports (during non-operational hours of the aerodromes)
is not used.
APPENDIX 4
3.1.1 The MWO does not receive routine air-reports by voice communications and disseminate them to
WAFCs and other meteorological offices.
Remark: Routine aircraft observations are not made.
APPENDIX 5
1.2.2* In TAF for Liepaja aerodrome, the lowest forecast visibility is always given.
1.3.1 a)* The surface wind criteria for the inclusion of change groups in TAF or for the amendment of TAF
are not used.
Remark: The threshold values of surface wind are not established by the MET and ATS authorities
and operators. Compliance is expected by 2007.
2.2.2 c) The criteria for indicating surface wind changes in landing forecasts are not used.
Remark: The threshold values of surface wind are not established by the MET and ATS authorities
and operators. Compliance is expected by 2007.
APPENDIX 8
1.1 b), f) Data in digital form not supplied. Automated pre-flight information systems for self-briefing
　
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