Meteorologists are raising alarms over worsening polar vortex conditions that could bring extreme cold and widespread disruptions.Why It MattersSo far, this winter has seen one of the warmest Decembers on record in much of the northern United States. Though many residents experienced snow around the holidays, snow coverage was still at or near 20-year lows.However, the polar vortex could bring severe weather conditions, including heavy snowfall and freezing temperatures, that could affect travel conditions or prompt school closures.What To KnowAccording to temperature outlook data, mapped by Pivotal Weather, North Dakota could see temperatures as low as 8 degrees on New...