Most of Mississippi can expect temperatures below ... As they describe it, the polar vortex circles the north pole counterclockwise. the polar jet stream circles at a lower level of the atmosphere ...

The Polar Vortex in the upper atmosphere has disintegrated after the intense warming of the stratosphere in mid-March.

BISMARCK, N.D. (AP) — Harsh cold descended on the nation’s midsection Monday as a polar vortex gripped the ... Tennessee, Mississippi, Alabama, West Virginia, Virginia and Ohio.

Several days with temperatures of 10-20 degrees below the historical average could be dangerous to plants and ruin outdoor ...

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 sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe.

"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 ...

The Polar Vortex in the upper atmosphere has disintegrated ... The big storm clusters that moved from the mid-Mississippi into the Tennessee Valley have caused severe flooding problems.

A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe.

Don't put away those winter coats just yet. An April cold snap is forecast for much of the eastern half of the U.S. early next week, forecasters said, with freezes likely across portions of the ...