Record-breaking cold clobbers two-thirds of the United States
The polar vortex is a mass of freezing air that normally spins around the North Pole, but has slipped southward and swirled into the United States.
Jan 29, 2019, 15:33 PM IST
The polar vortex is a mass of freezing air that normally spins around the North Pole, but has slipped southward and swirled into the United States.
Jan 29, 2019, 15:33 PM IST