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Another blast of arctic air is charging into the U.S. behind a powerful winter storm sweeping across the northern tier.
Wind chills reached subzero Thursday morning in some places, with lows into the single digits across portions of the Dakotas and Upper Midwest.
The cold air is pushing in behind an arctic front impacting hundreds of millions across the eastern portion of the country.
High temperatures will be 20-30 degrees below average, the FOX Forecast Center said.
With winds gusting over 50 mph for millions, wind chill values will be dangerous for some.
While temperatures may feel warm to start Thursday morning for areas like New York City, temperatures will continue to fall through the day.
Lows will fall into the 20s along the Interstate 95 corridor and into the teens for interior portions of the Northeast.
“These chilly temperatures are extending all the way down to the South,” FOX Weather Meteorologist Britta Merwin said. “So there’s a lot of us in company.”
Across the Southeast, the cold returns as well, especially for Friday when highs will be 10-20 degrees below average.
Record lows are even possible for portions of the Carolinas on Friday morning.
Record or not, low temperatures on Friday morning will be in the teens for millions as far south as Alabama, Georgia, and Mississippi.
“This is a good time of year to check your carbon monoxide monitors in your home and make sure that your fireplace is cleaned out, so you’re staying warm in a safe way,” Merwin advised.
A warmup will arrive in the eastern U.S. early next week.