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US Slowly Thaws, Polar Vortex Leaves Mark
The Polar Vortex explained
Polar Vortex: Why the US is suffering such cold weather
'Polar vortex' to blame for U.S. deep freeze
'Polar vortex' promises deep freeze in US
Polar vortex brings life-threatening chill to US Midwest
Polar Vortex Expands to South, East
Polar Vortex 'could freeze eyeballs' - BBC NEWS
Warmer temperatures ahead as polar vortex eases grip on U.S.
Bye-Bye Polar Vortex!
'Polar Vortex' Dumps Arctic Air on 187 Million Americans
Niagara River Freezes In Polar Vortex Covering Almost Half The U.S.
