
A strong coastal storm will bring moderate to major coastal flooding, strong winds, heavy rainfall and high surf to the Mid-Atlantic and New England. Tropical Storm Nolo is expected to strengthen into a hurricane today as it moves north toward the Big Island of Hawaii. Heavy rainfall may produce life-threatening, catastrophic flooding and mudslides. Read More >
NWS Telecommunications Gateway
National Program
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, use "Z" and obtain the forecast hour from the GRIB Product Definition Section.
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| A | Analysis (00 hour) | N | 18 hours forecast |
| B | 1 hour forecast | O | 24 hours forecast |
| C | 2 hours forecast | P | 30 hours forecast |
| D | 3 hours forecasts | Q | 36 hours forecast |
| E | 4 hours forecast | R | 42 hours forecast |
| F | 5 hours forecast | S | 48 hours forecast (2 days) |
| G | 6 hours forecast | T | 60 hours forecast |
| H | 7 hours forecast | U | 72 hours forecast (3 days) |
| I | 8 hours forecast | V | 84 hours forecast |
| J | 9 hours forecast | W | 96 hours forecast (4 days) |
| K | 10 hours forecast | X | 108 days forecast |
| L | 11 hours forecast | Y | 120 hours forecast (5 days) |
| M | 12 hours forecast | Z | Time contained in PDS |
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
NWS Telecommunications Gateway
5830 University Research Ct.
College Park, MD 20740
(301)-683-1518
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