Table C4
| Explanation of Data Designators T1T2A1A2ii CCCC |
| TABLE C4 |
| Reference time designator A2 (when T1 = D, G, H, J, O, P or T) |
| Instructions for the proper application of the level designators |
| (1) | The designators specified in this table should be used to the greatest extent possible to indicate the reference time of data contained within the text of the bulletin. |
| (2) | Where the table does not contain a suitable designator for the reference time, an alphabetic designator which is not assigned in the table should be used. |
| T1 | A2 | A2 - Reference Time Designator |
| D, G, H, J, O, P or T | A | Analysis (00 hour) |
| D, G, H, J, O, P or T | B | 6 hours forecast |
| D, G, H, J, O, P or T | C | 12 hours forecast |
| D, G, H, J, O, P or T | D | 18 hours forecast |
| D, G, H, J, O, P or T | E | 24 hours forecast |
| D, G, H, J, O, P or T | F | 30 hours forecast |
| D, G, H, J, O, P or T | G | 36 hours forecast |
| D, G, H, J, O, P or T | H | 42 hours forecast |
| D, G, H, J, O, P or T | I | 48 hours forecast |
| D, G, H, J, O, P or T | J | 60 hours forecast |
| D, G, H, J, O, P or T | K | 72 hours forecast |
| D, G, H, J, O, P or T | L | 84 hours forecast |
| D, G, H, J, O, P or T | M | 96 hours forecast |
| D, G, H, J, O, P or T | N | 108 hours forecast |
| D, G, H, J, O, P or T | O | 120 hours forecast (5 days) |
| D, G, H, J, O, P or T | P | 132 hours forecast |
| D, G, H, J, O, P or T | Q | 144 hours forecast |
| D, G, H, J, O, P or T | R | 156 hours forecast (7 days) |
| D, G, H, J, O, P or T | S | 168 hours forecast |
| D, G, H, J, O, P or T | T | 10 days forecast |
| D, G, H, J, O, P or T | U | 15 days forecast |
| D, G, H, J, O, P or T | V | 30 days forecast |
| D, G, H, J, O, P or T | W | Not assigned |
| D, G, H, J, O, P or T | X | Not assigned |
| D, G, H, J, O, P or T | Y | Not assigned |
| D, G, H, J, O, P or T | Z | Not assigned |