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Polar vortex leaves parts of U.S. Midwest in deep freeze
Polar vortex freezes US Midwest with dangerously cold air
Midwest sees all-time low temperatures due to polar vortex.
US Slowly Thaws, Polar Vortex Leaves Mark
Road chaos in US Midwest as biting polar vortex brings -50C | ITV News
White out and wipe out, the polar vortex spreads havoc across the US | #GME
Deep freeze grips U.S. Midwest, blamed for at least 12 deaths
How the 'polar vortex' is freezing major U.S. cities
Why the Midwest's deep freeze may be a consequence of climate change
Polar vortex brings life-threatening chill to US Midwest
Dangerous Polar Vortex Brings Cold Weather To The Midwest
'Polar vortex' promises deep freeze in US
