Making matters worse was the bitter cold, with wind chills dipping to near zero.
Northern Nevada shivered Friday in bone-chilling temperatures, and forecasters said colder weather was yet to come in the state, with tourists possibly seeing snow flurries over the weekend against the neon marquees of the Las Vegas Strip.
National Weather Service meteorologist Clay Morgan in Las Vegas said trace accumulations of snow were possible Saturday in hillside neighborhoods north and west of downtown Sin City, but measurable snow wasn't likely amid the casino resorts on Las Vegas Boulevard.
Forecasters warned that New Jersey drivers could face slippery conditions over the weekend as a wintry mix of snow and sleet moved into the state beginning Friday night into Saturday.
Authorities said a Sandoval County sheriff's sergeant struck by a vehicle on Interstate 25 while directing traffic after a snowstorm in New Mexico died. Sgt. Robert Baron had been with the sheriff's department for seven years.
People in parts of southwestern and central Ohio expected a brief reprieve from the snowfall that created hazardous driving conditions Friday before another round of snow was expected to move into the state Sunday.
A storm dumped several inches of sleet, ice and snow on much of Oklahoma.
Officials said at least two deaths were caused by the storm. A 5-year-old boy from Fort Gibson was killed Thursday in a vehicle crash, and Oklahoma City police reported that an unidentified man was discovered dead under an overpass.
In the hard-hit town of Hugo, about 160 miles south of Tulsa, residents and business owners said tree limbs cracked and power lines snapped under the weight of a layer of ice.
Snow began to let up in Oregon, but forecasters said arctic air would intensify the cold snap through the weekend.
The National Weather Service said conditions by the middle of next week could be milder and wetter.
This weekend's Dallas Marathon was canceled after an ice storm snarled travel in North Texas and left more than a quarter of a million homes and businesses without electricity. Schools canceled classes a day before, many businesses gave workers the day off, and frigid roads and sidewalks were mostly empty.
Fort Worth-based American Airlines and American Eagle canceled nearly 1,000 flights Friday due to foul weather in Texas. Dallas-based Southwest Airlines canceled almost 90 flights.
Temperatures were forecast to stay below freezing through the weekend, meaning residents may still have to contend with icy roads.
The National Weather Service says the cold snap has brought the coldest temperatures in three years to western Washington.
Meteorologist Josh Smith in Seattle says the forecast Saturday of 18 at Sea-Tac Airport would be the coldest since November 2010 and tie the record low set on Dec. 7 in 1972.
Organizers canceled Saturday's holiday parade in Walla Walla, saying they didn't want to expose the expected 5,000 spectators to temperatures forecast to be no warmer than 11 degrees.
The temperature Thursday at Pullman's airport was a record-breaking minus-3.