A powerful mid-November windstorm with gusts over 100 mph in some areas blasted the Pacific Northwest, northern Rockies and northern High Plains, downing trees, knocking out power to a million customers, even collapsing roofs.

(MORE: High Winds Turn Deadly in Washington)

East of the Cascades, the high winds have generated areas of widespread blowing dust, forcing major road closures and damaging roofs in parts of central and eastern Washington.

High winds have also closed a stretch of Interstate 25 north of Cheyenne, Wyoming, to light, high-profile vehicles due to an "extreme risk of blowover", according to the Wyoming Department of Transportation.

At least two semis were reportedly blown over on I-25 south of Cheyenne Wednesday morning, according to the National Weather Service. Another truck was blown over on U.S. 85 northeast of Cheyenne. The wind was so strong, there, that part of a Wyoming DOT sensor was blown down.

Frequently wind-prone Interstate 80 between Cheyenne and Laramie was also closed to all traffic early Wednesday due to high winds and poor winter driving conditions.

Wind gusts over 90 mph were clocked in the foothills near Boulder and Golden, Colorado, including a peak gust of 102 mph, at the appropriately-located National Wind Technology Center near Rocky Flats. 

Weather Underground blogger Bob Henson said in an email his home in Louisville, Colorado, was "groaning" from the high winds. "(I) don't have a reading, but subjectively, these are the strongest winds I recall in more than a decade here."

Some of the more impressive wind gust reports include:

• 119 mph at White Pass (elevation 5,970 feet) in the Cascades west of Yakima, Washington.
• 116 mph at Mission Ridge Summit (elevation 6,370 feet) in the Cascades near Wenatchee, Washington.
• 115 mph at Rattlesnake Mountain (elevation 3,560 feet) in south-central Washington; sustained winds hit 96 mph around sunset.
• 107 mph at Crystal Summit, just northeast of Mount Rainier in Washington.
• 102 mph at the National Wind Technology Center near Rocky Flats, Colorado.
• 101 mph on Schweitzer Mountain in far northern Idaho.
• 98 mph at Sedge Ridge in western Yakima County, Washington.
• 94 mph at the NCAR Mesa Lab on the south side of Boulder, Colorado.
• 90 mph at Three Corner Rock in south-central Washington.
• 89 mph at Emkay, about 14 miles west-southwest of Cheyenne, Wyoming.
• 86 mph on Naselle Ridge in southwest Washington.
• 86 mph on Mount Hebo (elevation 3,160 feet) in the Coast Range of western Oregon.
• 84 mph at Bordeaux, Wyoming, north of Cheyenne
• 77 mph at Rawlins in south-central Wyoming
• 76 mph at Kahlotus, a small farming town in southeast Washington (elevation 1,230 feet)
• 76 mph at Sheridan, Wyoming

In eastern Washington, Spokane International Airport gusted to 71 mph shortly before 4 p.m. Tuesday. The National Weather Service said that was the strongest non-thunderstorm wind gust ever recorded at that location.

High winds have also battered western Montana, with gusts to 80 mph reported in and near Glacier National Park Tuesday.

Wednesday's strongest winds impacted the northern Rockies to northern Plains, with numerous gusts over 50 mph. Gusts reached as high as 72 mph in North Dakota.

Nearly a Foot of Rain Reported

According to the National Weather Service, widespread rainfall amounts of 3 to 6 inches with local totals of 9 to 11 inches have already been recorded in the mountains of western Washington in the three days ending Sunday. In the rain shadow of the Olympic Mountains, rainfall in the Seattle-Tacoma-Olympia corridor has been lighter. Seattle-Tacoma International Airport saw 4.45 inches of rain Thursday through Sunday.

Rivers swelled above flood stage in western Washington thanks to this deluge, with the worst flooding occurring north and northeast of Seattle.

The Skykomish River in Snohomish County near Gold Bar crested at its third highest level on record late Tuesday, over 7 feet above flood stage, the highest level since the record-setting November 2006 flood.

Flood waters swamped the town of Sultan, about six miles downstream from Gold Bar, Tuesday night, prompting of a rescue of one woman forced to climb out her front window, according to King5.com.

The Snohomish River at Monroe, seven miles west of Sultan, was rising to a crest Wednesday morning just over five feet above flood stage, with flooded homes, roads and farmlands expected to be flooded. The National Weather Service in Seattle. River levels of 31 feet at Snohomish could overtop levees, with major levee damage possible, according to the NWS.

Flooding along the Stillaguamish River near Arlington prompted a shutdown of state route 530 east of the city, and flooded several homes. The river crested at its highest level in almost five years Tuesday, 6.5 feet above flood stage.

(MORE: Thousands Lose Power, Flooding Reported)

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