The 'polar vortex' is in the forecast. Here's what it means. - Grand Forks Herald

1. The 'polar vortex' is in the forecast. Here's what it means.  Grand Forks Herald
2. Historic, record-breaking cold is in the forecast for Midwest as polar vortex descends  The Washington Post
3. Polar vortex arrives in Pa.; Here's some tips for how to cope with below-zero cold  PennLive
4. Science Says: Get used to polar vortex outbreaks  WTNH.com
5. Chicago Will Be Colder Than Parts of Antarctica This Week  Mental Floss
6. View full coverage on Google News

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