According to the National Weather Service, a polar vortex will impact most of the country this weekend, here is what you need to know.

A brutal polar vortex is set to bury the Big Apple in snow Sunday and then deliver deadly single-digit temperatures that will feel like 15 degrees below zero.

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with Donald Trump's inauguration expected to be the coldest in 40 years.

We start the following work week with a polar vortex. This will bring in unseasonably cold air to the region and wind chill temperatures back to the negatives. But what is a polar vortex? The polar vortex is the jet stream above the Arctic Circle.

The polar vortex is a large area of low pressure, winds, and cold air surrounding both of the Earth’s poles, according to the National Weather Service. The term “vortex” refers to the circulation of air that helps keep the colder air near the Poles. This vortex has always existed and is not something new.

Abnormal weather events and severe winter storms could be caused by a disrupted polar vortex. Find out here how the polar vortex affects the weather.

A series of cold fronts the last few weeks has kept Florida downright chilly, as another winter storm starts to take aim this weekend

A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder Arctic air than last week.

the National Weather Service forecast for New York City shows chances of rain and snow over the weekend and the high temperature only reaching 26 degrees Monday. The polar vortex is a large area ...

Another blast of winter weather is expected in parts of the U.S. in the coming days, including bone-chilling wind in the Northern Plains and unusual snow and ice in the Gulf Coast area.

As snow begins to cover the Texas Panhandle amid the polar vortex, here's what the state can expect as weather conditions begin to shift.