Support for this research was provided through the NOAA Office of Global Programs. Kriste Paine (formerly of CDC) helped with initial processing and early analyses. Craig Anderson deserves thanks for digitizing the U.S. map used here. Discussions with Joe Barsugli, Marty Hoerling, Brant Liebmann, Prashant Sardeshmukh, and Jeff Whitaker (all at CDC) are gratefully acknowledged.
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