Active spring pattern across the center of our nation with several episodes of severe weather and heavy rainfall expected into next week. The potential for very large hail, long track tornadoes, severe wind gusts, frequent cloud to ground lightning strikes and flash flooding are in the outlook. Furthermore, dangerous early season heat wave continues for the Gulf Coast states into early next week. 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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