Circular 35. North Atlantic Trial of an Augmented Programme of Upper Air Observations

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Circular 35

North Atlantic Trial of an Augmented Programme of Upper Air Observations

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CIRCULAR 35-AN/O 0 CIRCULAR NORTH ATLANTIC TRIAL OF AN AUGMENTED PROGRAMME OF UPPER AIR OBSERVATIONS Published by authority of the Secretary General INTERNATIONAL CIVIL AVIATION ORGANlZATlON MONTREAL CANADA

This Publication is issued in English, French and Spanish. P Published in Montreal, Canada, by the International Civil Aviation Organization. Correspondence concerning publications should be addressed to the Secretary General of ICAO, International Aviation Building, 1080 University Street, Montreal, Canada. Otders for ICAO publications should be sent, on payment In Canadian curreficy , to In Sterling or Irish currency sld, to Secretary General, ICAO, Her Majesty's Stationery Office, International Aviation Building, P.O. Box 569, 1080 University Street, London, S. E. 1, Montreal, Canada. England. Cable address ICAO MONTREAL Cable address WHOLECORN, SEDIST, LONDON In French currency fr, to In Egyptian currency L.E. , to ICAO Representative, IC A0 Representative, European and African Office, Middle East Office, 60bk, avenue d'IQna, Wadie Saad Building, Paris 16e, France. Sharia Salah el Dine, Cable address ICAOREP PARIS Zamalek, Cairo, Egypt. Cable address ICAOREP CAIRO In Peruvian currency soles, to In Australian currency s/d, to ICAO Representative, ICAO Representative, South American Office, Far East and Pacific Office, Apartado 680, 10 Weybridge Street, Lima, Peru. Surrey Hills, E.10, Cable address ICAOREP LIMA Melbourne, Australia. Cable address ICAOREP MELBOURNE. In Indian currency Rs. ford Eook and Stationery Company, . Scindia touse New Delhi, India.

TABLE CF CClNTErlTS -- Pane 3 Introduction ...o.....s.........O........................................ History ................................................................. 3esults of Analysis ................................................o... Wind Data fron 14eteorologicdl Offices ................................. nD" Value Data from 14eteorological Offices ........................... Wind Data from Actual Flights ........................................ Factors Contributing to Inconclusive Results ............................ Accuracy of VD" Value Reports from Aircraft ............................. Conclusions and Recommendations .................................,....... 'Appendix A,- Plan and Organization ....o................................. Apendix B.- Detailed Description of Data hceived by ICAO .............. Appendix C.- Analysis of Data ..........o....O............................ Wind Data from Heteoyological Offices ................................. ............................ nDn Value Data from leteorological Cffices Wind Data from Actual Flights ..............e........................L Appendix D.- Analysis of Errors of Wind Forecasts for Various Routes Using llActual" Winds Determined from Charts as Standard of Reference ............................................... Appendix E.- "Dn Value Data from 1bteoroloeical Offices ................. Appendix F.- Analysis of Errors of Wind Forecasts for Various Routes Using I1Actualfl Winds as Determined from Flight Data as Standard of Reference ...................................... Appendix G.- Summary of 500 mb. Actual Tail Wind Components ............. Appendix 11.- Information Obtained from the United Kingdom and the United States Concerning the Accuracy of "D" Value Reports ................. from lleteorological econnaissance Flights

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