North America was hammered by one of the worst snow storms in living memory this Christmas, with at least 72 people killed in the US and Canada by the astonishingly low sub-zero temperatures, which hit -40C in some areas.
Storm Elliott brought bitter winds, heavy snow and ice and caused transport chaos at one of the busiest times of the year for travel as thousands of flights were cancelled, cars were stranded and buildings left without power thanks to the most damaging spell of winter weather since the notorious Great Blizzard of 1977.
