We thank Beth Ebert and Huqiang Zhang for advice on verification methods, Harry Hendon for advice on predictability and POAMA, Frederic Vitart for discussions of tropical versus extratropical prediction skill, Eunpa Lim for suggestions on the title and discussions about the southern annular mode, and Phil Reid for advice on sea ice. Beth Ebert, John McBride, and Mike Tippett kindly read earlier versions of this paper. HZ receives funding support from the Australian Climate Change Science Program, AHS was supported by the U.S. Office of Naval Research (N00014-415 12-1-0911), and the Managing Climate Variability Program is acknowledged for their support of POAMA and its products.
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