"There is nothing unusual about this since the polar vortex is always present and there are always spokes and always surges of cold air during the winter in our hemisphere. In any given place or time, the surge of cold air can be more or less intense and travel a longer or shorter distance from the pole."
However, the term 'polar vortex' is being used misleadingly. Due to the actual center of the vortex being in the northern hemisphere, it never moves through the atmosphere above the States. It just remains stationed farther north.
http://www.weather.com/news/weather-forecast/arctic-cold-finish-january-20140117
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