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.

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 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 ...

Once the snow starts to come in, the temperature will essentially drop like a rock,” Fox Forecast Center Meteorologist Marissa Lautenbacher told The Post.

The center at 12th and Vliet is open from 8 a.m. to 5:30 p.m. on Monday and Tuesday due to the cold. Nick Tomaro with the Milwaukee Health Department said more than 100 people took advantage of the center on day one. Darnell Bonner said on Sunday, he was rushed to the hospital for hypothermia while waiting for a shelter to open.

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

With severely cold temperatures forecasted in York County this week, utility companies are advising customers to take safety and energy-saving precautions. The National Weather Service in State College issued a cold weather advisory beginning at 7 p.m. and running until noon Wednesday.

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

The coldest air that we’ve felt in six years has Michigan in its icy grips today. The cold blast originating in northern Siberia is going to stick with us into Wednesday - rivaling the last deep freeze of this type we felt in 2019 when the Polar Vortex dipped down to send our temps plummeting.