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Story summary
- A polar vortex drove a deep cold snap across the United States, with temperatures 30 to 40 degrees below average.
- Detroit and Boston posted their coldest weather in nearly a decade.
- Florida recorded record lows, with Melbourne, Florida, at 25°F.
- Icy sidewalks and slush puddles have made daily commutes treacherous.
- Forecasters say the deep freeze could persist into early spring because of a stratospheric warming event.
