Several rounds of severe thunderstorms are ongoing and expected from the central and southern High Plains to the Southeast U.S. through Sunday. Large hail, damaging winds, and a few tornadoes will be possible. Thunderstorms may also bring areas of excessive rainfall which could bring flooding to parts of the aforementioned areas through Sunday. 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
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