AP reports:
NASHVILLE, Tenn. (AP) – A winter storm that brought a rare white Christmas to parts of the South barreled up the East Coast on Saturday night, with forecasters predicting 6 to 10 inches of snow Sunday for Washington and blizzard conditions for New York City and the New Jersey shore.
http://apnews.excite.com/article/20101226/D9KBB0R80.htmlAs the graph above shows, the pattern that has been in effect over the last month continues, with cold arctic air flowing out of polar regions, and warmer air being sucked northward.
http://climatecrocks.com/2010/12/26/white-christmas-in-southeast-heatwave-in-hudson-bay/Climate Central explains:Warmer Arctic May Mean Cold Blasts for Some
Blasts of cold and snow have gripped Europe and the United States in recent weeks, from Minneapolis to Paris. These weather conditions are leading to speculation about the role climate change may be playing in altering such extreme events.
Recent scientific studies have shown that the dramatic warming that has been occurring in the Arctic during the past few decades, along with the associated loss of sea ice cover, may be changing atmospheric circulation patterns throughout the northern hemisphere. This could be contributing to the recent outbreaks of unusually cold and snowy weather. Sea ice loss during the spring and summer melt season, which leaves a thinner and more sparse ice cover throughout the fall and early winter, is a key suspect in influencing winter weather patterns. When the ice melts, it allows incoming solar radiation to warm water and air temperatures, which in turn has an influence on atmospheric pressure and circulation, and may help shift Arctic air southward, while the Arctic remains unusually warm.
http://www.climatecentral.org/gallery/graphics/arctic-paradox-warmer-arctic-may-mean-colder-winters-for-some/