Record Cold Expected to Grip Much of US

The U.S. National Weather Service is warning that much of the United States this week will see the coldest temperatures in almost 20 years.   The weather service says the widespread chill is the result of a relatively infrequent alignment of weather conditions, allowing the Arctic polar vortex to travel unusually far to the south.   A polar vortex is a counterclockwise rotating pool of cold, dense air that will affect more than half of the continental U.S. into Monday and...

© La Voix de l'Amérique - dimanche 5 janvier 2014