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My own general sense of this is that colder winters in the US, especially east of the Rockies, might be associated with the documented melting of the permafrost in the Arctic, the line for which has moved south significantly over the last couple of decades. Crudely put, permafrost melts in the warmer arctic summers and much colder air moves to mid-latitudes on the surface earlier in the winter, facilitating, perhaps, warmer arctic winters. This would provide a positive feedback loop for arctic warming.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Thu Dec 9th, 2010 at 12:29:41 PM EST
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