A polar vortex has brought chilling air to the parts of the US this week. State of emergencies have been declared in several Midwestern states as record low temperatures are threatened to be broken.
In Chicago, workers have set fire to some of the rail lines to keep the trains running. Across the region, officials have closed schools until the cold air passes.
The cold air has led to extremely low wind chills being recorded. Wind chills in the Chicago area have reached below –50 degrees Fahrenheit, and wind chills well below –20 degrees have been recorded and forecasted across the Midwest.
Officials have warned that the low temperatures could be life threatening and urged people to take shelter.
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