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  1. What Is The Polar Vortex? | Weather.com

  2. Another blast of Arctic air: this time, with a stretched but strong ...

  3. Why Is The Polar Vortex Important - The Weather Channel

  4. Ask the Meteorologist: What is the polar vortex, and why do we …

  5. Polar vortex - Wikipedia

  6. What is the Polar Vortex? - National Weather Service

  7. Polar vortex: Your questions answered - CNN International

  8. What is the polar vortex and how does it affect Australia?

  9. What is a polar vortex? And what does it mean for us next week?

  10. Another polar vortex is headed to Florida, with an Arctic blast to ...