Warning of bitterly cold days ahead for areas of US as record snow hits

Forecasters in the US warned of sub-zero arctic air and dangerously cold wind chills across much of the country as snow continued to pile up in one city which already has nearly 63ins on the ground.

A storm in Erie, Pennsylvania, brought 34ins of snow on Christmas Day, an all-time daily snowfall record, and another 24.5ins by Tuesday night.