Triple polar vortex sends temperatures plunging in central and eastern U.S. as 1st Arctic cold blast moves in YahooCold Weather Forecast to Bring Chilliest Temperatures of the Season The New York TimesColdest temperatures of the season hit Midwest, Northeast ABC NewsA ‘triple dip polar vortex’ is coming. Will Colorado be affected? The ColoradoanIowa weather: Another round of measurable snow this weekend KCCI
