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Story summary
- A polar vortex is bringing record-low temperatures and winter weather across the United States starting tonight.
- Winter weather warnings cover 30 states, with wind chills reaching -30°F in some areas.
- The Midwest and Northeast may see single-digit temperatures and snowfall in parts of Ohio, Pennsylvania, and New England.
- By Friday, New York and Chicago may reach record lows.
- Indiana experienced a 45-car pileup due to icy conditions.
