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Polar vortex hits US: 'Life-threatening' cold sweeps across central American states
Polar Vortex: Why the US is suffering such cold weather
Deadly polar vortex grips North America
Arctic Blast + Polar Vortex Analysis
Americans Face Polar Vortex Big Chill: Almost half the US hit by freezing arctic conditions
'Polar vortex' to blame for U.S. deep freeze
US Braces for Big Freeze: Polar vortex storm to hit US and Canada as Arctic weather sweeps continent
Heavy snow hits Midwest amid record-breaking cold
North America Facing Arctic Snowstorm: Polar vortex storm set to hit US and Canada
Polar vortex leaves parts of U.S. Midwest in deep freeze
Polar vortex storm to hit US and Canada: North America prepares to face Arctic weather conditions
Deadly arctic blast sweeps Northeast
