An organized cluster of severe thunderstorms moved across the interior pacific northwest.  These thunderstorms were very strong wind producers with marginal hail, and blowing dust ahead of the main gust front.  Areas would have visibilities reduced below one quarter of a mile for a brief period of time.  The strongest estimated wind gust was 80 mph.

Thunderstorm Wind in MORROW, OREGON
From 15-SEP-13 16:33:00 to 15-SEP-13 16:33:00 (PST-8)
Location: BOARDMAN
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated wind gusts 80 mph.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 16:40:00 to 15-SEP-13 16:40:00 (PST-8)
Location: ECHO COONS ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Public reported 28 power poles downed.

Thunderstorm Wind in MORROW, OREGON
From 15-SEP-13 16:45:00 to 15-SEP-13 16:45:00 (PST-8)
Location: BOARDMAN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Public reported several power poles downed.

Thunderstorm Wind in MORROW, OREGON
From 15-SEP-13 16:48:00 to 15-SEP-13 16:48:00 (PST-8)
Location: MUNLEY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported 6 to 12 inch diameter tree down and power outage.

Thunderstorm Wind in MORROW, OREGON
From 15-SEP-13 16:50:00 to 15-SEP-13 16:50:00 (PST-8)
Location: MUNLEY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half of a barn roof blown off reported on social media.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 16:52:00 to 15-SEP-13 16:52:00 (PST-8)
Location: UMATILLA
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a wind gust of 66 mph.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 16:55:00 to 15-SEP-13 16:55:00 (PST-8)
Location: HERMISTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Employee of Hermiston Bowling Alley reported a semi truck trailer without a cab had flipped onto its side.  Also power was out in his location.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:00:00 to 15-SEP-13 17:00:00 (PST-8)
Location: PILOT ROCK
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Lots of limbs and part of a tree downed.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:09:00 to 15-SEP-13 17:09:00 (PST-8)
Location: PENDLETON
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Gust of 64 mph was measured by the weather station at the Pendleton WFO.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:11:00 to 15-SEP-13 17:11:00 (PST-8)
Location: (PDT)PENDLETON ARPT
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Pendleton airport ASOS recorded wing gusts up to 70 mph.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:11:00 to 15-SEP-13 17:11:00 (PST-8)
Location: (PDT)PENDLETON ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts up to 60 mph estimated, and a power outage was reported.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:15:00 to 15-SEP-13 17:15:00 (PST-8)
Location: PENDLETON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three foot diameter tree split from high winds, part of the tree fell onto a pickup truck bed.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:25:00 to 15-SEP-13 17:25:00 (PST-8)
Location: HELIX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated wind gusts to 60 mph downed 6 to 8 inch diameter tree limbs.

Thunderstorm Wind in UMATILLA, OREGON
From 15-SEP-13 17:30:00 to 15-SEP-13 17:30:00 (PST-8)
Location: UMAPINE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio operator reported estimated wind gusts of 60 mph and reduced visibility due to blowing dust.

Hail in MORROW, OREGON
From 15-SEP-13 13:30:00 to 15-SEP-13 13:30:00 (PST-8)
Location: IONE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public