A massive winter storm is sweeping across the US. Dangerously cold temperatures have been forecast, along with heavy snow and freezing rain that turns to ice on contact with a frozen surface. These extreme conditions have already cut electricity to over half a million households. Weather officials are warning of a prolonged storm with a crippling impact. Chapters: 0:00 Massive storm threatens large parts of US 2:22 Matthew Cappucci, Meteorologist For more news go to: http://www.dw.com/en/