As snow and ice continued to wreak havoc across the U.S. Saturday afternoon, more than 700,000 people were without power, and authorities in states including Texas and Virginia were warning residents to stay off the roads as much as possible.

More than 100 million people were under a winter weather advisory Saturday coast-to-coast, the National Weather Service Weather Prediction Center said. That could continue through Tuesday.

“A very active weekend is ahead for winter weather as large parts of the U.S. experience concerns for extreme cold temperatures, heavy snow and ice,” the weather organization said on Twitter. “Coast to coast from the Pacific Northwest to the Mid-Atlantic, there is