A coast-to-coast winter storm swept from Oregon and Washington to the southeast on Sunday, part of a frigid weather pattern that created record low temperatures in Minnesota and a 100-vehicle traffic pile-up in Texas and that is now producing dangerous conditions across much of the country because of heavy snowfall, perilous ice and dangerously low temperatures.

The National Weather Service said early on Monday that at least 150 million Americans were under ice or winter weather advisories.

Hundreds of thousands of people were without power. Trucks slid off highways and cars piled up on ice-coated roads. As the storm continued to intensify, officials urged residents to brace themselves.

“The time to prepare for this storm was yesterday,” the National Weather Service in Texas said in an ominous warning issued on Sunday.

Just over 11 inches of snow fell in Seattle, and a record low temperature — minus 50 degrees Fahrenheit — was set in one part of Minnesota. As the storm pushed into Texas, it was expected to deliver the kind of sustained cold and icy conditions.

“This will be probably more snow over a larger swathe of land to a higher degree than ever before in Texas history,” governor Greg Abbott of Texas said at a news conference.