Showers and thunderstorms capable of producing widespread heavy rainfall will be possible across much of Puerto Rico today. Heavy rainfall will likely lead to flash, urban and small stream flooding. Some areas may face life-threatening flooding. In the Southeast U.S., strong to marginally severe thunderstorms will be possible this afternoon. 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, 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 |
