hello and welcome to bbc news. tens of millions of people in the united states are in the grip of a major winter storm, with blizzards and record low temperatures sweeping the country. around 60% of the us population is currently under a weather warning, on one of the busiest travel weekends of the year. the storm extends from quebec to texas. the us state of montana registered a record breaking low of 45 celsius. the authorities say at least 19 people have been killed so far. sancha berg reports. a blinding snowstorm in buffalo. this is what zero visibility looks like. driving was banned. no planes could land or take off. this northern part of new york state has been hit hard by the bomb cyclone, an enormous winter storm. while further south, there have been floods. we have had ice, flooding, snow, freezing temperatures and everything that mother nature could wallop us with this weekend. the storm had already swept across the country forcing traffic off the road, bringing d