How freezing North Pole temperatures arrived at the U.S.

Aired: 1/7/2014 | 0:03:51 | Clip
The strong winds that normally keep the masses of very cold air contained near the North Pole weakened this week, allowing frigid temperatures to reach down into the United States. Judy Woodruff talks to Andrew Freedman of Climate Central about the science behind the polar vortex.

SHARE