We thank Aiguo Dai and Pedro L. Silva Dias and two anonymous reviewers for their helpful comments. We are grateful to Dave Gochis for providing the NERN precipitation dataset through the UCAR/JOSS Web site. This study was sponsored by NOAA’s Office of Global Program’s GEWEX Americas Prediction Project/Pan American Climate Studies (PACS/GAPP) North American Warm Season Precipitation Initiative.
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