Cold air from north Canada brings wind-chill warnings over area stretching down to Mexico border
Much of the United States is experiencing very cold conditions as cold air plunges south from northern Canada all the way to the Gulf coast, giving freezing temperatures across most of the country.
An area of low pressure in the Great Lakes region brought snow and bitter winds. Twenty centimetres (8in) of snow was reported in the twin city area of Minneapolis-Saint Paul in Minnesota on Wednesday. The surge of cold air also affected areas farther west, with a sharp cold front bringing a dramatic 22C (40F) drop in just 30 minutes in Cheyenne, Wyoming.