A massive winter storm continued Sunday morning, dumping sleet, freezing rain and snow across the South and up through New England, bringing frigid temperatures, widespread power outages and treacherous road conditions.

The ice and snowfall were expected to continue through Monday in much of the country, followed by very low temperatures, causing “dangerous travel and infrastructure impacts” to linger for several days, the National Weather Service said.

Heavy snow was forecast from the Ohio Valley to the Northeast, while “catastrophic ice accumulation” threatened from the Lower Mississippi Valley to the Mid-Atlantic and Southeast.

“It is a unique storm in the sense that it is so widespread,” weather service meteorologist Allison Santorelli said in a phone interview. “It was affecting areas all the way from New Mexico, Texas, all the way into New England, so we’re talking like a 2,000 mile spread.”

As of Sunday morning, about 213 million people were under some sort of winter weather warning, she said. The number of customers without power was approaching 800,000, according to poweroutage.us, and the number was rising.