An intense surface low pressure system moved from west to east along the Southern British Columbia border and dragged a cold front through as well. The resulting high winds brought about substantial damage across Eastern Washington. In addition heavy rain over the two days preceding and occurring with the windstorm brought about river rises, mudslides, and debris flows.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 07:20:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media relayed a report of trees and wires down due to the wind between Napa and Pittsburgh streets in Spokane, WA.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 07:20:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The broadcast media relayed a report of trees and wires down on Elk/Camden road in Spokane, WA.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 07:20:00 (PST-8)
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The broadcast media relayed a report of trees and wires down on Cedar N and Northwest blvd in Spokane, WA.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 07:21:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The broadcast media reported trees and wires down at Wellesly and E River Road in Spokane, WA.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 07:30:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A member of broadcast media reported trees and wires down at Bowdish and 8th avenue in Spokane, WA.

Debris Flow in CHELAN, WASHINGTON
From 09-DEC-15 07:15:00 to 09-DEC-15 07:30:00 (PST-8)
Location: LEAVENWORTH
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An emergency manager reported a mudslide on SR-2 just west of Leavenworth, WA. The road was closed and the flow was estimated at 10 feet deep.

High Wind in OKANOGAN VALLEY, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 08:30:00 (PST-8)
Magnitude: 58.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Utility Company

A utility company reported trees falling into powerlines causing power outage to 700 customers in Bridgeport, WA.

Flood in CHELAN, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 11:45:00 (PST-8)
Location: CASHMERE DRYDEN ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An emergency manager reported minor flooding along Mission creek with debris against the bridge along Mission creek road near mile post 3. One residence threatened from flooding.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 11:00:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A member of broadcast media reported that approximately 2,500 customers were without power as of 1115 AM PST in Spokane, Washington.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 07:00:00 to 09-DEC-15 10:55:00 (PST-8)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A member of broadcast media reported damage to roof at the US postal service facility near the Spokane airport not far from Spokane, Washington.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 06:00:00 to 09-DEC-15 06:45:00 (PST-8)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS at Fairchild AFB near Airway Heights, WA reported a wind gust of 53 mph.

High Wind in WASHINGTON PALOUSE, WASHINGTON
From 09-DEC-15 06:40:00 to 09-DEC-15 07:00:00 (PST-8)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A mesonet 3 miles southwest of Thornton, WA reported a wind gust of 63 mph.

High Wind in SPOKANE AREA, WASHINGTON
From 09-DEC-15 06:50:00 to 09-DEC-15 07:00:00 (PST-8)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at the Spokane International Airport near Airway Heights, WA reported a wind gust of 52 mph.

Debris Flow in WHITMAN, WASHINGTON
From 08-DEC-15 00:00:00 to 08-DEC-15 21:00:00 (PST-8)
Location: GRINNELL
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A member of the broadcast media reported a mudslide fully blocking highway 27 2 miles north of Palouse, WA.

Debris Flow in CHELAN, WASHINGTON
From 08-DEC-15 00:00:00 to 08-DEC-15 14:00:00 (PST-8)
Location: LUCERNE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

The Forest service reported water and rock/mud over 8301 road between Lucerne and Holden, WA.