This work was supported by NSF Grants ATM-0735030 and ATM-0849689 and NOAA Grant NA04OAR4310139. NCEP Reanalysis data and CPC Precipitation data were provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, available online from their Web site at http://www.cdc.noaa.gov/. The work benefitted greatly from discussions with Eric DeWeaver and from comments from Michael Alexander and two anonymous reviewers.
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