Tens of millions of Americans have endured bone-chilling temperatures, blizzard conditions, power outages and cancelled holidays after a winter storm that forecasters said was nearly unprecedented in its scope.

The conditions exposed 60% of the US population – more than 200 million people – to some sort of winter weather advisory or warning.

The US National Weather Service’s map “depicts one of the greatest extents of winter weather warnings and advisories ever”, forecasters said.

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