Siberian air is descending on Canada. Here's what to know about the 'polar vortex' – National Post

  1. Siberian air is descending on Canada. Here’s what to know about the ‘polar vortex’  National Post
  2. Parts of Canada will be bitterly cold this weekend — but don’t call it a polar vortex  CBC.ca
  3. Extreme cold warnings in effect across Prairies, parts of Ontario and Quebec  Global News
  4. Arctic surge bringing ‘very cold conditions’ to Toronto this weekend  CityNews Toronto
  5. Sharp temperature drop in Ontario as coldest air of the year arrives  The Weather Network

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