The polar vortex sliding south into the Midwest is sending temperatures to their lowest levels in more than 30 years and, in some cases, setting records.
While it usually sits over the Arctic, the polar vortex is being pushed south by an unseasonably warm air mass to the north.
The life-threatening cold is paralyzing the region — closing schools, businesses and courthouses; grounding flights; and keeping millions confined to their homes.
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