Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >
Instructions for the proper application of the reference time designator
1. The designator 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. When the table does not contain a suitable designator for the reference time, an alphabetic designator which is not assigned in the table should be introduced and the WMO secretariat notified.
| Designator |
|
Designator |
|
| A | Analysis (00 hour) | N | 39 hours forecast |
| B | 3 hours forecast | O | 42 hours forecast |
| C | 6 hours forecast | P | 45 hours forecast |
| D | 9 hours forecasts | Q | 48 hours forecast |
| E | 12 hours forecast | R | 54 hours forecast [48+6] |
| F | 15 hours forecast | S | 66 hours forecast [+12] |
| G | 18 hours forecast | T | 78 hours forecast |
| H | 21 hours forecast | U | 90 hours forecast |
| I | 24 hours forecast | V | 102 days forecast |
| J | 27 hours forecast | W | 114 days forecast |
| K | 30 hours forecast | X | 126 days forecast |
| L | 33 hours forecast | Y | 138 days forecast |
| M | 36 hours forecast | Z | 150 days forecast |
