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Polar Vortex: Why the US is suffering such cold weather
The Polar Vortex explained
Polar vortex freezes US Midwest with dangerously cold air
'Polar vortex' to blame for U.S. deep freeze
'Polar vortex' causes US traffic chaos
'Polar vortex' promises deep freeze in US
Polar Vortex Hits Northeast US
Polar Vortex Brings Historic Cold Temps, and More
U.S. cold expected to ease, as record-breaking polar vortex retreats
US Slowly Thaws, Polar Vortex Leaves Mark
Polar Vortex Expands to South, East
Huge areas of U.S., Canada suffer under extreme cold
