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

Portland was forecasted to be about 6 degrees below normal Sunday and Monday, according to the National Weather Service.

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.

A major winter blast of snow, ice, wind and plunging temperatures in the U.S. stirred dangerous travel conditions from central and southern states all the way to the East Coast early Monday, prompting schools and government offices in several states to close.

The eastern two-thirds of the U.S. is dealing with bone-chilling cold temperatures and wind chills, forecasters said. Temperatures could be 12 to 25 degrees (7

Jan. 5—The eastern U.S. is on track for a frigid week as a polar vortex stretches south, bringing below-normal temperatures to Maine. Starting Monday, much of the eastern two-thirds of the ...

The polar vortex of ultra-cold air usually spins around the North Pole ... a weather service meteorologist based in Gray, Maine. The cold air was expected to grip the Eastern Seaboard as far south as Georgia, with temperatures dropping into the low ...

The polar vortex of ultra-cold air usually spins around ... a weather service meteorologist based in Gray, Maine. The cold was expected to grip the Eastern Seaboard as far south as Georgia ...

A combination of frigid air with a low pressure system over the Gulf are behind the storm, which could bring heavy snow just south of the Interstate 20 corridor across northern Louisiana and into Mississippi and a mix of snow, sleet, and freezing rain near the Interstate 10 corridor from Houston to Mobile, Alabama.

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not seen in years.

Winter weather is expected in Maine on Sunday, with several inches of snow set to be followed by frigid temperatures as the week goes on. Forecasters expect snow to accumulate Sunday afternoon into the evening.

Winter weather is expected in Maine early next week, followed by frigid temperatures. Forecasters expect snow to accumulate Sunday afternoon into the evening. The Portland area could see anywhere from 4-8 inches,