A significant portion of the U.S. is experiencing below-average temperatures due to a disrupted polar vortex, affecting over ...

A major polar vortex is about to hit the US and could bring weeks of frigid temperatures for millions, with even a chance of ...

Severe winter chill is expected to plunge central and eastern states into below average temperatures as the polar vortex ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

The first cold wave will reach the East Coast on Thursday, followed by another surge of frigid air this weekend and more next ...

Winter has settled in for the long haul, and the next few days only reinforce that feeling. Tonight brings mostly cloudy ...

Here’s the wind chill chart. Notice the four shadings, indicating how long it will take for frostbite. When we get to wind ...

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

Cold temperatures are expected to last through the end of the month — and forecasters say that there's a potential for snow ...

A fierce Arctic blast of bitterly cold air is poised to overtake much of the central, eastern and southern U.S. over the next ...

The polar jet stream, which is affected by the polar vortex above it, has become quite wavy, allowing Arctic air to ...

Don't let the incoming string of relatively warm days in the greater Philadelphia region fool you; the polar vortex is still around.