The extremely dangerous heat wave continues across the East Coast and much of the South-Central U.S. today. Record high temperatures are expected for some areas especially across the Mid-Atlantic where extreme heat risk conditions reside. There is a Slight Risk (level 2 of 5) of severe thunderstorms today for the northern Mid-Atlantic into portions of southern New England. 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) | L | 84 hours forecast |
| B | 6 hours forecast | M | 96 hours forecast |
| C | 12 hours forecast | N | 108 hours forecast |
| D | 18 hours forecasts | O | 120 hours forecast |
| E | 24 hours forecast | P | 132 hours forecast |
| F | 30 hours forecast | Q | 144 hours forecast |
| G | 36 hours forecast | R | 156 hours forecast |
| H | 42 hours forecast | S | 168 hours forecast |
| I | 48 hours forecast | T | 10 days forecast |
| J | 60 hours forecast | U | 15 days forecast |
| K | 72 hours forecast | V | 30 days forecast |
| W-Z | Not assigned |
