The National Weather Service has issued an extreme cold watch from 4 a.m. Thursday until noon Friday for Chicago.
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 Polar vortexes are a year-round phenomenon. But Chicago-area residents only notice them when they
collapse, experts say. That’s what’s happening starting Thursday when dangerously frigid air from Siberia and the North Pole is forecast to plunge the Great Lakes region into subzero territory for multiple days. Related articles: | | | |
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