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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  

CBS Meetings
Reports of Meetings
Telecommunications Abbreaviated Heading
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
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