1. NOAA/Physical Sciences Laboratory, Boulder, Colorado;
2. NOAA/Physical Sciences Laboratory, and Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado;
3. Department of Geography and Environment, University of Hawai‘i at Mānoa, Honolulu, Hawaii;
4. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California;
5. Research Applications Laboratory, National Center for Atmospheric Research, Boulder, Colorado;
6. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, and NOAA/National Integrated Drought Information System, Boulder, Colorado;
7. Dartmouth College, Hanover, New Hampshire;
8. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York;
9. Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, Colorado;
10. NOAA/National Centers for Environmental Information, Boulder, Colorado