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

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, about 10 to 30 miles above the North Pole, during the winter season. It is always present near the poles, though it weakens during summer and intensifies in winter.

More than 400 flights were delayed or canceled at Denver International Airport on Monday as a polar vortex continued to freeze Colorado. There were 394 delayed and 27 canceled flights as of 12:40 p.m.

A rare winter storm is getting set to slam the Gulf Coast and South, with cities from Texas to Florida under Winter Storm Warnings.

Some areas of the U.S. may see temperatures as low as -20 or -30 degrees early next week as arctic air from Siberia rolls in.

The polar vortex is expected to reach the Utah-Idaho border sometime in the late afternoon and evening Friday as it continues to move south. As it moves through parts of the state, it will produce small snow showers, bringing more snow to the region before drier conditions return.

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.

the polar vortex is still going to bring lower-than-normal temperatures to the Sunshine State. According to the National Weather Service in Tampa Bay, cooler than normal temperatures could be seen ...

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into next week, impacting millions of Americans in nearly all of the contiguous states.

A rare winter storm is set to blanket the southern US in snow and ice as the entire East sees temperatures plunge to their lowest point this winter, bringing 'life-threatening' conditions.

Mid-Michigan schools canceled classes on Tuesday to avoid sending students into frigid weather during the morning commute.