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The positive NAO index phase

  • The positive NAO index phase shows a stronger than usual subtropical high pressure center and a deep than normal Icelandic low.
  • The increased pressure difference results in more and stronger winter storms crossing the Atlantic Ocean on a more northerly track.
  • This results in warm and wet winters in Europe and in cold and dry winters in northern Canada and Greenland.
  • The eastern US experiences mild and wet winter conditions.

    Notes: