The winter of 2014 - 2015 is off to an early start over the Northern Plains, where a December-like blast of Arctic air is bringing heavy snows and wintery cold. The early season cold air outbreak is due, in part, to the influence of Super Typhoon Nuri, which caused a ripple effect on the jet stream when the remains of the typhoon "bombed" over the weekend into one of the most intense extratropical storms ever observed in the waters west of Alaska. This superstorm forced the jet stream to bulge far to the north over western North America, bringing a strong ridge of high pressure responsible for numerous daily record high temperatures in California, Nevada, Idaho, Montana, Wyoming, and Washington over the weekend. A compensating southwards dip in the jet is now materializing over the North Central U.S., where an unusually powerful trough of low pressure is pushing southeastwards. This trough will give most of the eastern two-thirds of the U.S. high temperatures 10 - 20°F below average by late in the week.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=2856
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