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 | - |