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The jet stream is much farther south than normal,China Football Jerseys Cheap, allowing the cold air to push in from the Arctic and drop temperatures by 20 to 40 degrees below normal levels,Bob Cousy Jersey, AccuWeather meteorologist Tom Kines said.
Areas of Montana and the Dakotas were forecast to reach lows in the minus-20s,Cheap NFL Jerseys, while Laramie,White NFL Jerseys Cheap, Wyo. is expected to see a low temperature of 28 below. The icy arctic blast was expected to be followed by another one later in the week,Cheap Jordan Shoes Free Shipping, creating an extended period of cold weather that hasn't been seen since the late 1990s, meteorologists said.