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UK weather: Snow-laden 'Arctic U-turn' to swoop across Britain as Polar Vortex sparks imminent 'major cold blast'
Winter threatens to roar back with a vengeance as a rip in the Polar Vortex sparks warnings for an imminent major cold blast.
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Rare polar vortex split to freeze millions of Americans - chilling path of severe weather event mapped
Forecasters warn that a split polar vortex is set to bring a 'large supply of cold air' to North America in mid-February as a ...