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The nation isn’t done with the “Polar Vortex” yet. Although temperatures will not challenge last week’s single digit fare, AccuWeather said the brief respite from sub-freezing temperatures is at an end. AccuWeather.com reports in the wake of the mild air that has been sitting over much of the eastern half of the nation over the past few days, colder weather will move in for the end of the week. This surge of cold air will be a piece of the polar vortex breaking off and coming southward. The cold air will begin to push into the northern Plains and Great Lakes on Thursday and will continue to push south and east, reaching the East Coast by the weekend. This time around, the cold will not be nearly as bitter as the cold wave that smashed records in places early last week. During that stretch, many places had temperatures that were 30 to 40 degrees below average. This blast of colder air will produce temperatures that are closer to 10 degrees lower than average. Many places along the I-95 corridor will still have highs near or above freezing at the peak of the chill this weekend. “This next main arctic blast [...]