The authors thank Eugenia Kalnay, Ming Cai, Zoltan Toth, and Mozheng Wei for helpful comments regarding the breeding method. Comments of Harry Hendon and two anonymous reviewers helped to improve the manuscript and were highly appreciated. The CMAP observations and the NCEP reanalysis data were kindly provided by the Climate Prediction Center. This study was supported by the National Oceanographic and Atmospheric Administration under Grant NA16GP2021 and the National Science Foundation under Grant ATM-0094416.
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