We thank two anonymous reviewers for comments that lead to an improved manuscript. We thank Edmund Chang for useful comments on annular modes. This research was supported by the National Science Foundation (ATM0332910), the National Aeronautics and Space Administration (NNG04GG46G), and the National Oceanic and Atmospheric Administration (NA04OAR4310034 and NA05OAR4311004). The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies.
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