Dr. Amy Butler with the National Oceanic and Atmospheric Administration says the early polar vortex disruption is unusual and just one of three ever recorded.

Maine has plunged into an arctic freeze before winter has even officially arrived and these bitter temperatures may stick ...

The first of three rounds of bitter air has arrived, threatening record lows in cities from the Midwest to the Northeast.

Temperatures dropped to near zero — with wind chills in the negatives — Thursday night into Friday morning as the chilly air set in behind an arctic cold front.

But the frigid lows didn't quite break records, though they came close, according to the National Weather Service.

Cold temperatures are set to continue on Monday, but New England will feel another icy blast of Arctic air linked once again ...

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

The first of three rounds of cold Arctic air from a shifting polar vortex has sent temperatures plunging across the central and eastern U.S., threatening centuries-old record lows in cities and towns ...