Table C3
| Explanation of Data Designators T1T2A1A2ii CCCC |
| TABLE C3 |
| Geographical area designator A1 (when T1 = D, G, H, O, P, Q, T or Y) and geographical area designator A2 (when T1 = I or K) |
| 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 geographical area of the data contained within the text of the bulletin. |
| (2) | Where the geographical area of the data does not correspond exactly with the designator, the designator for the area most approximating that of the data may be used. |
| (3) | When the table does not contain a suitable designator for the geographical area, an alphabetic designator which is not assigned in the table should be introduced and the WMO Secretariat notified. |
| Note: For T1T2= SZ, A1A2 area designator from Table C1 should be used. |
| A1 | Geographical Area Designator |
| A | 0° - 90°W northern hemisphere |
| B | 90°W - 180° northern hemisphere |
| C | 180° - 90°E northern hemisphere |
| D | 90°E - 0° northern hemisphere |
| E | 0° - 90°W tropical belt |
| F | 90°W - 180° tropical belt |
| G | 180° - 90°E tropical belt |
| H | 90°E - 0° tropical belt |
| I | 0° - 90°W southern hemisphere |
| J | 90°W - 180° southern hemisphere |
| K | 180° - 90°E southern hemisphere |
| L | 90°E - 0° southern hemisphere |
| N | Northern hemisphere |
| S | Southern hemisphere |
| T | 45°W - 180° northern hemisphere |
| X | Global Area (area not definable) |