Polar Vortex Sends Frigid Air Through North America

A large part of the United States is in the grip of extremely cold weather. Some places in the Midwest are experiencing record-low temperatures that have forced suspension of some basic services and caused disruption of work and school schedules. Officials are warning residents they could get frostbite within minutes. VOA's Zlatica Hoke reports that in some places, the frosty weather is expected to linger until Friday.