By AMANDA LEE MYERS, Associated Press Writer Mon Jan 22, 1:39 PM ET
PHOENIX - More than a foot of snow fell on parts of northern Arizona, and several more inches were possible Monday, while children as far south as Tucson got a rare chance to play in the snow.
Sunday's storm, one of the strongest of the winter, came amid a wave of storms that have brought snow, ice and strong winds to the Plains region, and also to the Southwest, including Arizona, Texas and New Mexico.
The harsh, frigid conditions were blamed for at least 11 traffic fatalities in the Plains over the weekend. In Colorado, crews looking for a missing snowshoer found a body in a creek southwest of Denver Monday, but authorities had not determined whether it was the missing man.
Southern New Mexico picked up 9 inches on snow on Sunday and Monday, closing 145 miles of the Interstate 25, the state's major north-south highway. "The semi-trucks are having a hard time," State Police Lt. Rick Anglada said, noting that three tractor-trailers had jackknifed on I-25 and 10 to 15 rigs had pulled off the roadway.
Some public schools in the southern and western parts of the state closed Monday.
Although the heaviest snowfall in Arizona on Sunday was in the north, snow also fell in downtown Phoenix and Tucson, which received up to 1 1/2 inches, according to the National Weather Service.
Danita D'Water said there were huge snowflakes in her neighborhood in far northeast Phoenix.
"The children are running up and down the street, riding their scooters in the snow," she said. "The kids are pretty excited but the adults were out taking pictures."
More than a foot fell in Forest Lakes, Pinetop and at the Sunrise Ski Resort, among other places in northern Arizona. Between one and three inches fell in Flagstaff, said Robert Bohlin, meteorologist with the National Weather Service.
A winter storm warning remained in effect until noon Monday for parts of northern and northeastern Arizona, with the National Weather Service forecasting up to an additional three inches of snow.
Dense fog and icy roads created hazardous driving conditions Monday morning in the Tucson area.
In Colorado, 3 to 6 inches of snow fell across much of the Front Range, with more in the in the eastern plains and the mountains. Strong winds created whiteout conditions on the state's eastern plains. Dozens of schools opened late or closed Monday in eastern Colorado.
Few details were released about the body found near Chatfield Reservoir, which was near the area where Mel Dinklage, 46, went snowshoeing alone on Saturday. Jefferson County sheriff's officials said Dinklage was an inexperienced snowshoer who wasn't familiar with the area.
On Sunday, officials closed a long stretch of Interstate 70, from near Denver International Airport almost to the Kansas state line because of high winds, blowing snow, poor visibility and ice. The road had reopened by Monday morning.
In Oklahoma, where an ice storm disrupted power to as many as 125,000 homes and businesses more than a week ago, about 17,000 electrical customers remained without power early Monday  mostly in the eastern part of the state.
Hundreds of utility linemen worked through the night in hopes of fully restoring power by Monday or Tuesday, authorities said. But for some rural customers, it could be at least another week before the electricity is back on.
Warmer temperatures led to melting ice and snow that turned roads into slushy rivers, yards into quagmires and streams into rushing torrents.
Muddy roads and pastures caused some utility equipment to bog down, slowing their progress, said Michelann Ooten, spokeswoman for the Oklahoma Department of Emergency Management.
"Extremely muddy conditions in some areas are making it difficult for some electrical restoration crews," Ooten said.
A pickup truck carrying radioactive materials used in pipeline scanning equipment was swept from a bridge and disappeared in a swollen creek in Oklahoma's Pittsburg County, said Undersheriff Richard Sexton.
The truck's two occupants escaped unharmed, but efforts to locate the truck and its radioactive cargo were suspended after dark. He said officials hope the creek's level will fall enough on Monday to reveal the truck's whereabouts. A container with the material is bolted to the truck.
"The radioactive materials are still in the truck, and that's what we're worried about," Sexton said.
In Missouri, more than 45,000 people remained in the dark from the same storm.
Winter weather has also hit hard on the East Coast, bringing snow, sleet and freezing rain to Virginia, Washington, D.C., and Maryland and making roads treacherous. An accident on Interstate 81 in Virginia killed one person and injured five, authorities said. Several school districts in northern and western Virginia were closed Monday.
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On the Net:
National Weather Service: http://www.nws.noaa.gov/
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Associated Press writer Tim Talley in Oklahoma City contributed to this report.
On Sunday, at least a foot of snow fell in parts of Northern Arizona, and it was expected that a few more inches of snow would fall on Monday.  The National Weather Service said that up to 1½ inches of snow also fell in Phoenix and up to 1 inch, average of under one inch, in Tucson, which are both located in Southern Arizona.

On Sunday and Monday, Southern New Mexico received 9 inches of snow, leading to the closing of 145 miles of Interstate 25 between the cities of Socorro and Las Cruces, New Mexico.  The interstate was reopened late Monday afternoon.