Triple polar vortex to plunge central and eastern U.S. into Arctic cold through mid-December - Yahoo

1. Triple polar vortex to plunge central and eastern U.S. into Arctic cold through mid-December  Yahoo
2. A triple-dip Polar vortex is coming. Will your state feel the chill?  USA Today
3. Iowa weather: Another round of measurable snow this weekend  KCCI
4. Millions wake up to extreme cold that’s breaking records as it spreads east  CNN
5. Frigid temperatures blast the Midwest and the Northeast with coldest weather yet  NBC News