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PBS News Hour
Midwest sees all-time low temperatures due to polar vortex
Extreme winter weather in the Midwest has left at least 15 people dead. Power outages and extreme stress on utility systems added to worries in Chicago and Detroit, while in Wisconsin, emergency shelters sought to offer the homeless refuge from the cold. A respite from the record-breaking deep freeze is expected this weekend, as the cold air moves east. Amna Nawaz has more on the weather crisis.
