"Bitter cold could linger through the end of the month," the Weather Prediction Center said in an update on Monday.

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

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

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

Ontario may be one of the coldest places on the planet this Friday as an airmass is expected to be centred over the province, ...

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

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

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

Watch as a massive bowl of Arctic air is set to bring extreme, potentially record-breaking cold temperatures to parts of the ...

More snow is on the way for southern Ontario, with a widespread shot occurring on Wednesday. That will be followed by ...

Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.