A lobe of the polar vortex, a ring of freezing air typically ... minus-20 are forecast to reach as far south as Oklahoma and Arkansas — frostbite is possible in less than 30 minutes under ...

The cause of the week-long deep freeze? A polar vortex collapse. Now, meteorologists are calling for another collapse in the middle of March, one that could plunge the U.S., Canada, and parts of ...

A satellite image shows the entry of a large area of low pressure, from the Polar Vortex, into the Northern U.S., on Jan. 6, 2014. (Bloomberg) -- High in the atmosphere above the North Pole ...

"The large polar vortex disruption from the second week of March is playing a key role in next week’s eastern US cold snap," meteorologist Judah Cohen of Atmospheric and Environmental Research told ...

An April cold snap is expected to bring unusually cold temperatures to the eastern half of the US next week. The cold snap could impact new spring vegetation and lead to frost in some areas.

"The large polar vortex disruption from the second week of March is playing a key role in next week’s eastern US cold snap," meteorologist Judah Cohen of Atmospheric and Environmental Research told ...