Winter Storm Blair: Millions across North America hit by polar vortex
As a winter storm barrels across North America, more than 60 million people across 30 US states could face the coldest temperatures and heaviest snowfall since 2011.
Moderated by Tomas Kauer 
As a winter storm barrels across North America, more than 60 million people across 30 US states could face the coldest temperatures and heaviest snowfall since 2011.
