We are grateful to Greg M. O’Donnell for his help with the simulations and graphics. This work was supported by the U.S. Environmental Protection Agency under Grant R 824802-01-0 to the University of Washington. Retrieval of the daily temperature and precipitation station observations from the NCAR archives was supported by NCAR under Grant 35371107. The second author’s work was supported by a fellowship in the NOAA Postdoctoral Program in Climate and Global Change.
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