WMO>WWW >WWW Operational Information Service (OIS)> Telecommunications Abbreviated Heading - TAAii CCCC   Explanation of Data Designators T1T2A1A2ii CCCC TABLE B7 Data type designator T2 (when T1 = L) Instructions for the proper application of the level designators (1)  The designator specified in this table should be used to the greatest extent possible to indicate the type of data contained within the text of the bulletin. (2) Where more than one type is contained in the text, the designator for one of the data types should be used. (3) When the table does not contain a suitable designator for the data type, an alphabetic designator which is not assigned in the table should be introduced and the WMO secretariat notified.   T1 T2 - Data Type GTS priority Code form name A Aviation routine reports ("METAR") 2   C Aerodrome Forecast ("TAF") (VT < 12 hours) 3   P Special aviation weather reports (“SPECI”) 2   S Aviation general warning ("SIGMET") 1   T Aerodrome forecast ("TAF")) (VT ≥ 12 hours) 3   V Aviation volcanic ash warning ("SIGMET") 1   Y Aviation tropical cyclone warning ("SIGMET") 1

WORLD WEATHER WATCH CBS Meetings Reports of Meetings OPERATIONAL INFORMATION SERVICE Telecommunications Abbreaviated Heading TTAAii CCCC Symbolic Structure explained Table Definitions Table A Table B1 Table B2 Table B3 Table B4 Table B5 Table B6 Table B7 Table C1 Table C2 Table C3 Table C4 Table C5 Table C6 Table C7 Table D1 Table D2 Table D3 Indicator BBB CONTACT US...

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