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The negative NAO index phase

  • The negative NAO index phase shows a weak subtropical high and weak Icelandic low.
  • The reduced pressure gradient results in fewer and weaker winter storms crossing on a more west-east pathway.
  • They bring moist air into the Mediterranean and cold weather to northern Europe.
  • The US east cost experiences more cold air outbreaks and hence snowy winter conditions.
  • Greenland, however, will have milder winter temperatures.

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