The Arctic Oscillation (AO) is a large-scale climate pattern that influences weather throughout the Northern Hemisphere. It alternates between a positive phase (left) and a negative phase (right). In its positive phase, the AO tends to bring warmer weather to the middle latitudes; in its negative phase, winter storms are more common in the eastern United States and Europe.
Graphic Credit: J. Wallace, University of Washington. Used with permission.
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Last modified:
3 January 2017 - 4:45pm