The long-range data shows we may be done with a true Arctic air mass similar to what we experienced in January. But we ...

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not seen ...

It's a normal pattern that is stronger in the winter and tends ... stratosphere and blow the cold air from west to east. This strong circulation is known as a polar vortex. This story was updated ...

Like much of the U.S., Wisconsinites woke up Tuesday morning to bitter cold conditions. Many schools and colleges throughout the Milwaukee area closed as the area braced for the dangerous freezing ...

The United States has been experiencing severe winter storms ... 60F), is caused by the expansion of the polar vortex – an area of extremely cold, rotating air around the Arctic – southwards.

Winter is making its presence known in New York City, as the polar vortex is bringing brutally cold temperatures to the ...

The polar vortex is a large, whirling mass of cold air that usually extends across the Arctic. It becomes stronger in the winter, when the Northern Hemisphere leans away from the sun. Typically ...