1. National Oceanic and Atmospheric Administration, Durham, North Carolina;
2. Hydrology and Remote Sensing Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland;
3. National Aeronautics and Space Administration, Beltsville, Maryland;
4. U.S. Department of Agriculture, Washington, D.C.;
5. Nevada Water Science Center, U.S. Geological Survey, Carson City, Nevada;
6. Northern Research Station, Forest Service, U.S. Department of Agriculture, Madison, Wisconsin;
7. The Ohio State University, Columbus, Ohio;
8. South Dakota State University, Aberdeen, South Dakota;
9. Colorado State University, Fort Collins, Colorado;
10. Oklahoma State University, Stillwater, Oklahoma;
11. Natural Resource Conservation Service, U.S. Department of Agriculture, Washington, D.C.;
12. National Integrated Drought Information System, National Oceanic and Atmospheric Administration, and University Corporation for Atmospheric Research, Boulder, Colorado;
13. National Drought Mitigation Center, University of Nebraska–Lincoln, Lincoln, Nebraska;
14. National Integrated Drought Information System, National Oceanic and Atmospheric Administration, and Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado