Table A

Explanation of Data Designators T1T2A1A2ii CCCC

Data type designator T1 Matrix Table for T1T2A1A2ii definitions

Instructions for the proper application of the data type designators

T1	Data type	T2	A1	A2	ii	Priority
A	Analyses	B1	C1	C1	**	3
B	Addressed message	***	***	***	***	1/2/4*
C	Climatic data	B1	C1	C1	**	4
D	Grid point information (GRID)	B2	C3	C4	D2	3
E	Satellite imagery	B5	C1	C1	**	3
F	Forecast	B1	C1	C1	**	3
G	Grid point information (GRID)	B2	C3	C4	D2	3
H	Grid point information (GRIB)	B2	C3	C4	D2	3
I	Observational data (Binary coded) - BUFR	B3	C6	C3	**	2
J	Forecast information (Binary coded) - BUFR	B3	C6	C4	D2	3
K	CREX	C7	C7	C3	**	2
L	Aviation information in XML	B7	C1	C1	*	1/2/3
M	-
N	Notices	B1	C1	C1	**	4
O	Oceanographic information (GRIB)	B4	C3	C4	D1	3
P	Pictorial information (Binary coded)	B6	C3	C4	D2	3
Q	Pictorial information regional (Binary coded)	B6	C3	C5	D2	3
R	-
S	Surface data	B1	C1/C2	C1/C2	**	2/4*
T	Satellite data	B1	C3	C4	**	2
U	Upper air data	B1	C1/C2	C1/C2	**	2
V	National data	(1)	C1	C1	**	(2)
W	Warnings	B1	C1	C1	**	1
X	Common Alert Protocol (CAP) messages
Y	GRIB regional use	B2	C3	C5	D2	3
Z	-

*	Priority level: 1 is allocated to service messages 2 is allocated to data and request messages 3 is allocated to seismic waveform data (T1T2 = SY) 4 is allocated to "administrative messages"
**	See paragraph 2.3.2.2 for definition and use.
***	See paragraph 2.4.2 for definition and use.
(1)	Table B2 or national table.
(2)	To be determined.
NOTE: CLIMAT TEMP is not recommended for operations. See the Abridged Final Report with Resolutions and Recommendations of the 2010 Extraordinary Session of the Commission for Basic Systems (WMO-No. 1070).