It is so cold in Chicago they're lighting railroad tracks on fire - Ars Technica

1. It is so cold in Chicago they're lighting railroad tracks on fire  Ars Technica
2. N.J. weather: Watch for snow squalls, flash freeze as dangerous cold from polar vortex grips state  NJ.com
3. Polar vortex arrives in Pa.; Here's some tips for how to cope with below-zero cold  PennLive
4. How frigid polar vortex blasts are connected to global warming  EarthSky
5. US snow MAP: Chicago as cold as NORTH POLE as Midwest faces COLDEST WINTER in 50 years  Express.co.uk
6. View full coverage on Google News

from World - World United States - Google News http://bit.ly/2MF5m1y