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US Polar Vortex: Record-breaking low temperatures grip Americans
Record-breaking low temperatures grip Americans
Polar Vortex Sends Frigid Air Through North America
Deadly polar vortex grips the US
Polar Vortex: Deep Freeze Moves Across US
Blistering cold spreads to southern and eastern parts of U.S.
US battles record low temperatures
Polar blast grips the US as bitterly cold temperatures spread south
'Polar vortex' promises deep freeze in US
Road chaos in US Midwest as biting polar vortex brings -50C | ITV News
Deadly polar vortex grips North America
Polar Vortex: record-breaking temperatures expected to ease Thursday
