Storm Systems Dump Snow, Rain Across Much of U.S. : Weather: Warnings are posted for the Southwest and Rockies. A cold front blasts the Northwest coast with winds up to 81 m.p.h.

A complex of stormy weather produced snow, wind and thunderstorms Friday over the Rockies and Plains and threatened an area from the Southwest to the Great Lakes.

One storm system produced snow in the northern and central Rockies and the northern and central high Plains.

The storm dropped 10 inches of snow at Alta, Utah, and a foot of snow at the Pomerelle ski resort in Idaho. Mullan Pass, Ida., reported nine inches of snow overnight, and in southeastern Colorado the town of Beulah had a foot of new snow, the National Weather Service reported.

A second storm system spread a mixture of rain, freezing rain, sleet and snow from the central high Plains to the lower Great Lakes region.

As a result of the two storm systems, winter storm watches, warnings and advisories were issued for much of the area from Idaho and Nevada through the Rocky Mountains to the upper Mississippi Valley and southward into northern Arizona and New Mexico.

Up to eight inches of snow was possible by this morning in southwestern Nebraska, the weather service reported.

Strong thunderstorms developed ahead of the second of the two storm systems. Showers and thunderstorms extended across much of Oklahoma into southeastern Kansas, with the strongest thunderstorms in central Oklahoma.

Afternoon thunderstorms in central Oklahoma’s Logan County produced hail and high winds that downed several trees, the weather service said. Thunderstorms in northeastern Oklahoma also produced hail in Creek County.

A cold front, meanwhile, blasted the Northwest coast with winds gusting to 81 m.p.h., weather officials said. The winds were blamed Thursday for the deaths of a woman and her two children, and tens of thousands of homes were without power.

The winds subsided overnight and power had been restored to nearly all areas by Friday morning, utility companies reported.

A five-ton Douglas fir crashed down on a car Thursday evening near the eastern border of Mt. Rainier National Park, about 55 miles southeast of Seattle. A woman and her two children were killed in the accident, authorities said.

Winds of 60 m.p.h. toppled trees and cut power to more than 58,000 homes in western Washington. North of the border, an estimated 60,000 to 80,000 residents of Vancouver Island, British Columbia, lost power.

Ferry sailings between the island and mainland British Columbia were canceled. A spokeswoman said some ferry runs into Seattle also were canceled.

Wind also was a problem in parts of the southern Plains, with gusts to 52 m.p.h. at Guadalupe Pass in southwestern Texas.

Cold weather prevailed across the West with many afternoon temperatures Friday still below the freezing mark, and in the teens in the northern Rockies and parts of the central Rockies.