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

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 Polar Vortex in the upper atmosphere has disintegrated ... are expected to spread throughout Boston, New York, and Washington, D.C. The Arctic cold blast is expected to intensify and cover ...

Idaho, Oregon, and Washington state have been placed under ... winter weather starting in mid-March. Experts said a 'polar vortex collapse' will likely plunge the US back into the frigid weather ...

When the polar vortex begins to wobble and allows arctic air to spill south into northern Illinois in January, we usually end up with dangerously-cold air around Chicago. When it happens in April ...

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 ...

"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 ...