There will be daily chances for scattered thunderstorms across portions of the Central and Eastern U.S. through the weekend, with severe thunderstorms possible in the northern Plains and Upper Midwest. Potential severe storm hazards may include large hail, damaging winds, and a few tornadoes. Storms could also produce heavy rain that may lead to isolated instances of flash flooding. Read More >
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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, 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 |
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
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