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Header - Line One

T1T2A1A2ii (sp) CCCC (sp) YYGGgg [(sp)BBB] (cr) (cr) (lf)

Where :

  • T1 and T2 are data type and/or form designators ;
  • A1 and A2 are geographic/data type/ time designators;
  • ii are distribution or level indicators;
  • (sp) = space;
  • CCCC identifies the communications center originating the product. The four letter code is defined in WMO Manual 9, Part C and in International Civil Aviation Organization (ICAO) Document 7910 , Location Indicators;
  • YYGGgg is the international date-time group (YY = day of month, GGgg = time in UTC);
  • BBB identifies bulletin continuation or amendments;
  • (cr) = carriage return; and
  • (lf) = line feed;


  • [Header Structure]



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