We are grateful to P. Klotzbach and M. Rajeevan for providing numerous details of the forecasting methodology used at the CSUTMP and IMD, respectively, including providing data and preprints of papers. Dr. Klotzbach, in particular, identified an important error in our original manuscript. We also thank Michael Tippett and Ben Kirtman for numerous discussions regarding this work. An anonymous reviewer brought several relevant references to our attention and made several constructive comments that led to clarifications in the final manuscript. Andrew Colman, acting as reviewer, also made helpful comments that led to clarifications in the final manuscript. This research was supported by the National Science Foundation (ATM0332910), National Aeronautics and Space Administration (NNG04GG46G), and the National Oceanic and Atmospheric Administration (NA04OAR4310034).
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