RENO, Nev. — Yet another snowstorm closed highways in parts of the West on Friday, the latest in a tiring week of bad weather, and a dangerous sheet of ice in parts of the Midwest contributed to a looming flood problem.

Winter storm warnings were in effect Friday for parts of Arizona, New Mexico, Colorado, Wyoming, Montana and the western Dakotas, and a blizzard warning covered the mountains of southwest Colorado.

"It's going to be a heck of a storm," said Chris Cuoco, senior forecaster for the National Weather Service in Grand Junction, Colo. "We're expecting significant snowfall in all the mountains of Colorado. Even the valleys are going to see 4-plus inches of snow."

Up to 20 inches of snow was forecast in parts of the Rockies, along with wind gusts of up to 80 mph. A snow slide in California's Sierra Nevada killed one man Thursday.

In the Midwest, freezing rain glazed streets and highways in the Chicago area. The Eisenhower Expressway — Interstate 290 — was closed for a time because of the ice, and the village of Lemont blocked off all its major intersections.

The full length of the Indiana Toll Road, more than 150 miles, was shut down for about two hours Friday morning because it was "an entire sheet of ice" with numerous accidents, said state trooper William Jones. Indiana also closed a 10-mile section of Interstate 69 just north of Fort Wayne.

Seven Indiana traffic deaths were blamed on the ice Friday, adding to four weather-related deaths in that state earlier in the week. In Indianapolis, a fire engine slid head-on into a tree, sending four firefighters to a hospital with minor injuries.

Temperatures could reach the 50s and even 60s in the region Saturday, after subzero readings earlier in the week, and a possibility of 2 inches of rain was forecast in Indiana.

The National Weather Service issued flood watches for much of Illinois, saying "the potential exists for very serious and potentially life threatening flooding."

Colorado closed at least two mountain pass highways.

Heavy snow and whiteout conditions in the Sierra Nevada on Thursday led authorities to intermittently shut down Interstate 80, the busy main link between northern Nevada and Northern California. The mountains around Lake Tahoe received about 2 feet of snow, bringing totals at some resorts in the past two weeks to 10 feet.

"This is one of the snowiest Christmas holiday periods I can remember," said Kent Hoopingarner, general manager at Homewood Mountain Resort.

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In eastern Washington, Spokane reached a snowfall total for the month of 46.2 inches, a record for December, said Laurie Nisbet of the weather service.

Farther west, the weight of snow, ice and water over the past week collapsed the roof of a high school in Olympia, Wash. There was severe water damage but no injuries, fire Lt. Ralph Dunbar said.

Snow and ice weren't the only problems. The weather service confirmed that it was two small tornadoes on Christmas Eve that caused scattered damage in Alabama.

Slippery roads and cold have been blamed for 11 deaths this week in Indiana; eight in Wisconsin; five in Ohio; four each in Kentucky, Michigan and Missouri; two in Kansas; and one apiece in Illinois, Oklahoma, Iowa, Massachusetts and West Virginia.