Metro Atlantans could find themselves in sub-zero wind chills early Tuesday, Channel 2 Action News meteorologist Brad Nitz said on Monday.

Nitz is forecasting an early morning low on Tuesday of 15 degrees.

“The wind chill will be falling into the teens and single-digits this evening,” Nitz said Monday. “Some sub-zero wind chills to start the day (Tuesday).”

Atlanta awoke to its coldest New Year’s Day in more than 40 years Monday, with temperatures in the teens and a biting wind that made it feel like 5 degrees outside.

And to top it off, snow sprinkled parts of the region.

The stunning cold gripped much of the nation. The National Weather Service posted wind-chill advisories and warnings across the South, the Plains and the Northeast. Wind chills in some parts of New England were as low as 45 degrees below zero.

In Atlanta the thermometer crept up to 28 by 4 p.m. Monday but went no higher before nightfall. Nitz forecast a low of 15 for Tuesday morning.

The regions’ deep freeze is the worst on New Year’s since 1977, when the temperature was a frigid 11 degrees, said Channel 2 Action News meteorologist Katie Walls.

The cold will be relentless most of the week. There’s little chance of snow during the week, but the cold will tax us in other ways.

“The cold weather will likely result in high demand for electricity across the region,” Channel 2 meteorologist Katie Walls said. “Power outages may result from the heavy electrical load. Those who require electricity for heating or medical equipment should consider having backup heat or electrical sources available.”

Meanwhile, a water main break at Peachtree Street and Peachtree Circle, in Midtown near the Buford Spring Connector, created icy conditions and closed part of the busy roadway in the afternoon.