Weather vlog: Why is it so cold in the Midwest and what is the “polar vortex”

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TWIN FALLS, Idaho (KMVT/KSVT) Extreme and dangerous cold invaded the Northern Plains, Upper Midwest, Great Lakes and even down into the Ohio and Tennessee River Valley the last week of January. The big reason was the change in the upper level weather pattern related to a circulation of arctic air known as the “polar vortex.” Chief meteorologist Brian Neudorff explains what this is, why it is so cold in his weather video blog

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