Arctic freeze continues to blast huge swaths of the US with sub-zero temperatures

BUFFALO, N.Y. — Brutally cold temperatures and dangerous wind chills stayed put across much of the U.S. Monday, promising the coldest temperatures ever for Iowa’s presidential nominating contest, holding up travelers, and testing the mettle of NFL fans in Buffalo for a playoff game that was delayed a day by wind-whipped snow.

About 150 million Americans were under a wind chill warning or advisory for dangerous cold and wind, said Zack Taylor, a meteorologist with the National Weather Service in College Park, Maryland, as an Arctic air mass spilled south and eastward across the U.S.

Sunday morning saw temperatures as low as minus 20 degrees Fahrenheit (minus 6.7 degree Celsius) to minus 40 F in northern and northeast Montana. Saco, Montana, dropped to minus 51 F (minus 26 C). Subzero lows reached as far south as Kansas, Missouri, Illinois and parts of Indiana, Taylor said.

About 150,000 U.S. homes and businesses were without power Monday, the bulk of them in Oregon after widespread outages that started Saturday.

Portland General Electric warned that strong winds forecast for Monday and threat of an ice storm Tuesday could delay restoration efforts.

The storm was blamed for at least four weekend deaths around Portland, including two people who died of suspected hypothermia. Another man was killed after a tree fell on his house and a woman died in a fire that spread from an open-flame stove after a tree fell onto an RV.

In Utah, where almost four feet (1.2 meters) of snow fell in the mountains over a 24-hour period, a snowmobiler was struck and killed Sunday night by a semitrailer about 70 miles (113 kilometers) southeast of Salt Lake City, according to the Utah Highway Patrol.

The person killed was among four snowmobilers attempting to cross U.S. Highway 40 in the Strawberry Reservoir area.

In Wyoming, a backcountry skier was killed after triggering a 50-feet (15-meter) wide avalanche. The victim was swept into a gully and through brush and trees, then remained buried for about fifteen minutes before being found by a companion in the mountains south of Alpine, Wyoming, on Sunday afternoon, according to the Bridger-Teton Avalanche Center.

It marked the third U.S. avalanche fatality in recent days, following a Wednesday accident at a California ski resort that killed one person and injured three others, and another that killed a person on Thursday in the Idaho backcountry near the Montana border.

Swirling snow and avalanche dangers prompted road closures Monday across parts of Utah and Colorado.