After a period of upper level ridging brought a return to above normal temperatures in early September, very strong easterly downslope and offshore winds off the Cascades and Coastal Ranges occurred. Winds increased rapidly during the afternoon and evening of September 7 with the passage of an unseasonably strong backdoor cold front, and persisted through much of the following day. This resulted in extremely critical fire weather conditions when the strong winds combined with extremely low relative humidity and exceptionally dry existing fuel conditions. The result was explosive growth of ongoing wildfires, and the new start and explosive spread of numerous new wildfires. Widespread wind gusts from 50-70 mph were common on ridge tops and numerous other in exposed areas, including portions of the greater Portland metro area, the Willamette Valley, and areas of the Oregon coast.  Strong winds caused widespread damage to trees, and downed numerous power lines across the region, which started at least 13 additional wildfires.  Large portions of the cities of Detroit, Mehama, and Gates were destroyed, and significant portions of Idanha, Mill City, and Lyons also burned. Resultant large wildfires included these named incidents - In Oregon: Beachie Creek, Chehalem Mountain/Bald Peak, Riverside, and Lionshead, and in Washington: Big Hollow. Rapidly spreading wildfires resulted in multiple fatalities, hundreds of displaced persons for many weeks, and billions of dollars in damage.

High Wind in COAST RANGE OF NW OREGON, OREGON
From 07-SEP-20 20:28:00 to 08-SEP-20 11:00:00 (PST-8)
Magnitude: 80.00 MG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Mesonet

The Mount Hebo (AR658) location recorded a max sustained wind of 48 mph with a max wind gust of 92 mph.

High Wind in NORTH OREGON CASCADES FOOTHILLS, OREGON
From 07-SEP-20 19:06:00 to 08-SEP-20 13:55:00 (PST-8)
Magnitude: 61.00 EG
Property damage: 2.00B
Crop damage: 0.00K
Reported by: Other Federal Agency

Fairly widespread tree damage, and power outages in the area caused by down trees, power lines.  Many areas of wind damage subsequently burned.

High Wind in CENTRAL OREGON COAST, OREGON
From 08-SEP-20 00:18:00 to 08-SEP-20 17:52:00 (PST-8)
Magnitude: 53.00 MG
Property damage: 120.00M
Crop damage: 0.00K
Reported by: Mesonet

Newport South Beach (SBEO3) reported a max sustained winds of 41 mph with gusts up to 58 mph. Yachats (E1135) recorded a max sustained winds of 32 mph with gusts up to 75 mph. Lincoln City (AR659) recorded a peak wind gust of 61 mph.

High Wind in GREATER  PORTLAND METRO AREA, OREGON
From 07-SEP-20 17:35:00 to 08-SEP-20 11:00:00 (PST-8)
Magnitude: 45.00 MG
Property damage: 100.00M
Crop damage: 0.00K
Reported by: Mesonet

The Portland ASOS (KPDX) recorded max sustained winds of 41 mph with a peak gust of 52 mph.

Strong Wind in CASCADES IN LANE COUNTY, OREGON
From 07-SEP-20 19:06:00 to 08-SEP-20 13:55:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 200.00M
Crop damage: 0.00K
Reported by: NWS Employee

An IMET on the Holiday Farm Fire took some pictures as well as estimated wind gusts from observations and RAWS sites that are likely lost to the fire. Attached pictures might not be precisely located within the zone as information was taken from unknown exact locations.

High Wind in NORTH OREGON CASCADES, OREGON
From 07-SEP-20 19:06:00 to 08-SEP-20 13:55:00 (PST-8)
Magnitude: 57.00 MG
Property damage: 1.00B
Crop damage: 0.00K
Reported by: RAWS

The Horse Creek RAWS (HSFO3) recorded a peak gust of 66 mph.

High Wind in NORTHERN OREGON COAST, OREGON
From 07-SEP-20 23:41:00 to 08-SEP-20 05:00:00 (PST-8)
Magnitude: 45.00 MG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: ASOS

The Tillamook AWOS (KTMK) recorded a peak wind gust of 52 mph.

Strong Wind in CASCADE FOOTHILLS IN LANE COUNTY, OREGON
From 07-SEP-20 19:06:00 to 08-SEP-20 13:55:00 (PST-8)
Magnitude: 35.00 EG
Property damage: 200.00M
Crop damage: 0.00K
Reported by: NWS Employee

An IMET on the Holiday Farm Fire took some pictures as well as estimated wind gusts from observations and RAWS sites that are likely lost to the fire. Attached pictures might not be precisely located within the zone as information was taken from unknown exact locations.