Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

Picture this: you're checking tomorrow's weather for the tenth time this week, and each time the forecast has shifted. What started as sunny skies morphed into scattered showers, then back to partly ...