Severe thunderstorms are expected today and Friday from the upper Midwest, central Great Lakes into the Ohio and mid-Mississippi Valley's. In addition, heavy rainfall threat increases on Friday across the Ohio Valley. Meanwhile, early summer-like heat wave across portions of southern Texas with new daily records are forecast today and through the weekend; The heat spreads across the Gulf States. Read More >
Instructions for the proper application of the data type designator
1. The designator specified in this table should be used to the greatest extent possible to indicate the type of data contained within the text of the bulletin.
2. Where more than one type is contained in the text, the designator for one of the data types should be used.
3. When the table does not contain a suitable designator for the data type, an alphabetic designator which is not assigned in the table should be introduced and the WMO secretariat notified.
| Designator | Data Type |
| A | Radar data |
| B | Cloud |
| C | Clear Air turbulence |
| D | Thickness (relative topography) |
| E | Precipitation |
| F | Aerological diagrams (ash clouds) |
| G | Significant weather |
| H | Height |
| I | Sky/cloud cover |
| J | Wave height + combinations |
| K | Swell height + combinations |
| L | Plain language |
| M | For national use |
| N | Radiation |
| O | Vertical velocity |
| P | Pressure |
| Q | Web bulb potential temperature |
| R | Relative humidity |
| S | Snow cover |
| T | Temperature |
| U | Eastward wind component |
| V | Northward wind component |
| W | Wind |
| X | Lifted index |
| Y | Observational plot chart |
| Z | Not assigned |
