Palm fronds line a street in the Los Feliz section of Los Angeles on Thursday, Dec. 1, 2011 after high winds flipped over trees and trucks and knocked out power to more than 300,000 California customers early Thursday before moving inland, where schools in a Utah town closed because of 100 mph wind gusts. (AP Photo/Alicia Chang)
Palm fronds line a street in the Los Feliz section of Los Angeles on Thursday, Dec. 1, 2011 after high winds flipped over trees and trucks and knocked out power to more than 300,000 California customers early Thursday before moving inland, where schools in a Utah town closed because of 100 mph wind gusts. (AP Photo/Alicia Chang)
This NOAA satellite image taken Wednesday, November 30, 2011 at 1:00 PM EST shows variable cloud cover over the West. Areas of light snow showers and high winds form in southeastern Idaho and Utah, ahead of cold front extending from the Northern Rockies through northern California. A variety of Wind Advisories and High Win Watches and Warnings remain in effect for parts of California through western Utah. Meanwhile, light to moderate snow showers with periods of heavy snowfall and windy weather conditions occur from Montana through the Northern Plains, ahead of a Canadian cold front dropping down from southern Canada. Winter Storm Warnings and Winter Weather Advisories are in effect for these regions through the evening. Snow accumulations for today are expected to range from 6 to 12 inches above 5,000 feet and 3 to 6 inches at lower elevations in the Northern Rockies. Snow Accumulations in the Northern Plains will range from 1 to 3 inches in the southwest and between 3 and 5 inches in the northwest. (AP Photo/Weather Underground)
A significant wind event will continue across California and the Great Basin, while snow will persist from the central Plains to central Great Basin. A cold front will trigger more snow showers to the Upper Midwest and Great Lakes.
Kindergarteners from a Jewish Community Center in Salt Lake City, Utah, take a quick field trip to the front of the JCC to check out the large pine that was knocked over by strong winds on Thursday, Dec. 1, 2011. High winds ripping through Utah have overturned several semi-trucks, knocked out power to more than 50,000 customers and prompted school closures. (AP Photo/ The Salt Lake Tribune, Francisco Kjolseth)
Neighbors help remove a tree that toppled onto the house of Don and Louise Lochhead in Bountiful, Utah, Thursday, Dec. 1, 2011. High winds ripping through Utah have overturned several semi-trucks, knocked out power to more than 50,000 customers and prompted school closures. (AP Photo/ The Salt Lake Tribune, Rick Egan)
PASADENA, Calif. (AP) ? Several overturned semis on a Utah highway. Hundreds of thousands without power in California. A wind gust reaching 123-mph in Colorado.
The powerful winds that tore across Western states Thursday created a path destruction that closed schools, left neighborhoods with a snarl of downed trees and power lines, and prompted some communities to declare emergencies.
The storms, described as a once-in-a-decade event, were the result of a dramatic difference in pressure between a strong, high-pressure system and a cold, low-pressure system, meteorologists said. This funnels strong winds down mountain canyons and slopes.
The system brought high wind warnings and advisories for California, Utah, Nevada, Wyoming, Arizona and New Mexico. The blustery weather is expected to eventually hit Oklahoma, Missouri and Indiana.
The violent winds eased but strong gusts still blew through the region Thursday night, at times reaching 60 mph in some California mountains. Forecasters said the winds would continue to diminish through Friday.
The winds were fanning fires in northern California.
The Sacramento Bee reported that as of Thursday evening, seven fires had burned more than 130 acres in El Dorado County. Five fires had also burned more than 250 acres in Tuolumne and Calaveras counties.
In Southern California, the storm knocked out electricity to more than 350,000 utility customers. By early Friday, 270,000 of them were still without power.
Gusts, which reached 80 mph, were blamed for toppling semitrailers and causing trees to fall on homes, apartment complexes and cars.
A state of emergency was declared in Los Angeles County, where schools in a dozen communities were closed.
In some neighborhoods, concrete light poles cracked in half. Darkened traffic signals and fallen palm tree fronds and branches snarled traffic. At a Shell station, the roof collapsed into a heap of twisted metal.
In heavily damaged Pasadena, schools and libraries closed and a local emergency, the first since 2004, was declared. Officials said 40 people were evacuated from an apartment building after a tree smashed part of the roof.
Pasadena is known for its historic homes and wide oak-lined streets that are frequently depicted in films.
Many residents Thursday blamed the city for protecting its old trees from over-trimming to such an extent that they have now become a public safety hazard.
Vince Mehrabian, the general manager at A&B Motor Cars, estimated eight Lexus, Cadillac and other luxury cars had been destroyed by fallen limbs. He said he'd been asking the city for four years to trim the trees more.
On a street around the corner, almost every tree was either cracked in half or missing limbs.
Elsewhere, Daphne Bell, a 30-year Pasadena resident, said she was kept awake by howling wind. "This is the worst, the absolute worst. There were times it sounded like a freight train was roaring down my driveway," she said.
Similar stories of downed trees and power lines echoed across the West, where winds in some areas ripped storefront awnings, filled gutters with debris and forced school closures.
In Utah, about 50,000 customers lost power along the state's 120-mile Wasatch Front as high winds took down power lines, but service was restored to more than half of them by Thursday night.
On Interstate 15, strong gusts blew more than 10 semi-trucks onto their sides, prompting authorities to temporarily close the highway to trucks. Commuter train travel was also interrupted after debris covered the tracks.
Schools closed in Centerville, where a 102-mph gust was reported. Mail delivery and trash pickup were canceled.
Davis County issued a disaster declaration to request state assistance, citing more than $3.5 million in estimated damage to infrastructure.
The Red Cross opened three centers to provide food and aid to people affected by the storm, and opened one overnight shelter in Ogden.
In Nevada, weather officials warned that blowing dust was creating visibility problems on a highway between Reno and Las Vegas.
In Steamboat Springs, Colo., the roof of a four-story condominium complex was blown off and about 100 trees were knocked over, some landing on homes. A ski area shut down its lifts after a gust of 123 mph.
Even some weather experts were surprised by the wind's force.
"It's one of the strongest events that I can remember," said Brian Edwards, a meteorologist with Accuweather. "It's rather rare."
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Associated Press writers John Rogers and Alicia Chang in Los Angeles, Jennifer Dobner in Salt Lake City, and Oskar Garcia in Las Vegas contributed to this report.
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