Nation Jan 15 Brutal arctic blast with sub-zero temperatures sweeps across the U.S. By Gillian Flaccus, Christopher Weber, Associated Press
Nation Feb 04 Polar vortex envelops Northeast with dangerously cold temperatures Arctic air descended into the Northeast on Saturday morning, bringing dangerously cold sub-zero temperatures and wind chills that dropped to minus 45 to minus 50 degrees Fahrenheit (minus 43 to minus 45 C) in many areas. By Mark Pratt, Associated Press
Nation Jan 27 Watch News Wrap: Rescue teams search for missing victims of deadly Quebec fire By PBS News Hour