'Coldest air of the whole winter' in forecast. Blame the polar vortex.

This year's relentless winter in the East is about to unleash its most savage cold outbreak yet.

"A brutally cold weekend awaits more than 100 million people in the northeastern quarter of the nation as Arctic air lunges southward straight from eastern Canada," AccuWeather senior meteorologist Alex Sosnowski said in an online forecast.

Temperatures will drop into the single digits or below zero across much of the Northeast, AccuWeather predicts. Dozens of daily record cold temperatures will be in jeopardy both on Saturday, Feb. 7 and Sunday, Feb. 8, according to Weather.com.

"This weekend could feature the coldest air of the whole winter in the Northeast and Mid-Atlantic," said Washington Post meteorologist Ben Noll on X.

The "significant Arctic outbreak will bring frigid temperatures and dangerously cold wind chills to the Northeast and the Mid-Atlantic this weekend (Feb. 7-8)," according to a forecast from NOAA's Weather Prediction Center.