| NOAA | National Oceanographic and Atmospheric Administration |
| USDM | United States Drought Monitor |
| EDDI | Evaporative Demand Drought Index |
| Cr | Credible Interval |
| NE | Northeast |
| UM | Upper Midwest |
| OV | Ohio Valley |
| SE | Southeast |
| NR | Northern Rockies and Plains |
| S | South |
| SW | Southwest |
| NW | Northwest |
| W | West |
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