APPENDIX 3. TECHNICAL SPECIFICATIONS RELATED TO METEOROLOGICAL OBSERVATIONS AND REPORTS (See Chapter 4 of this Annex.)
1. GENERAL PROVISIONS RELATED TO METEOROLOGICAL OBSERVATIONS 1.1 Recommendation.— The meteorological instruments used at an aerodrome should be situated in such a way as to supply data which are representative of the area for which the measurements are required. Note.— Specifications concerning the siting of equipment and installations on operational areas, aimed at reducing the hazard to aircraft to a minimum, are contained in Annex 14, Volume I, Chapter 9. 1.2 Recommendation.— Meteorological instruments at aeronautical meteorological stations should be exposed, operated and maintained in accordance with the practices, procedures and specifications promulgated by the World Meteorological Organization. 1.3 Recommendation.— The observers at an aerodrome should be located, in so far as is practicable, so as to supply data which are representative of the area for which the observations are required. 1.4 Recommendation.— Where automated equipment forms part of an integrated semi-automatic observing system, displays of data which are made available to the local ATS units should be a subset of and displayed parallel to those available in the local meteorological service unit. In those displays, each meteorological element should be annotated to identify, as appropriate, the locations for which the element is representative.
2. GENERAL CRITERIA RELATED TO METEOROLOGICAL REPORTS 2.1
Format of meteorological reports
2.1.1 Local routine and special reports shall be issued in abbreviated plain language, in accordance with the template shown in Table A3-1. 2.1.2 METAR and SPECI shall be issued in accordance with the template shown in Table A3-2 and disseminated in the METAR and SPECI code forms prescribed by the World Meteorological Organization. Note.— The METAR and SPECI code forms are contained in WMO Publication No. 306, Manual on Codes, Volume I.1, Part A — Alphanumeric Codes. 2.1.3 Recommendation.— METAR and SPECI should be disseminated, under bilateral agreements between States in a position to do so, in the WMO BUFR code form, in addition to the dissemination of the METAR and SPECI in accordance with 2.1.2. Note.— The BUFR code form is contained in WMO Publication No. 306, Manual on Codes, Volume I.2, Part B — Binary Codes. APP 3-1
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18/11/10