(NBC News) A deep freeze gripped almost the entire United States on Friday pushing temperatures to 20 below in Wyoming, emptying stores in Texas of firewood and threatening to knock out power across an ice-glazed swath of the South and Midwest.
Hundreds of flights were delayed and more than 100,000 people were left in the dark as sleet weighed down power lines and snapped tree branches. At least five governors declared states of emergency.
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