The U.S. is bracing for dangerously cold temperatures as a polar vortex stretches across the country, bringing life-threatening cold to millions. Following a weekend of deadly flooding, regions from the Midwest to the Northeast are preparing for a significant drop in temperatures, with some areas facing subzero wind chills. Forecasts predict single-digit temperatures and potential record lows this week, while the Arctic air gives rise to winter storms. Residents are urged to take precautions as the harsh cold is expected to impact over 100 million Americans, with additional snow and blizzard conditions likely. Expect a frigid week ahead, with the National Weather Service issuing warnings for blizzards and record-low temperatures in the coming days.