A major severe weather event by Pacific Northwest standards occurred over central and northeast Oregon and southeast Washington on May 30th. A powerful upper level storm system moved across the area during the afternoon and evening helping to trigger severe thunderstorms. The airmass was unusually unstable for this area of the country with surface dewpoints well into the 60s. With strong upper level winds in place the stage was set for numerous fast moving intense storms through the afternoon and early evening. Numerous reports of damaging winds were received across southeast Washington as the storms moved through.

Thunderstorm Wind in YAKIMA, WASHINGTON
From 30-MAY-20 16:45:00 to 30-MAY-20 16:50:00 (PST-8)
Location: UNION GAP
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Numerous trees down.

Lightning in FRANKLIN, WASHINGTON
From 30-MAY-20 16:00:00 to 30-MAY-20 16:30:00 (PST-8)
Location: PASCO
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Newspaper

Cattle company near Pasco lost 6 registered Charolais cattle during a lightning storm.

Thunderstorm Wind in KLICKITAT, WASHINGTON
From 30-MAY-20 15:22:00 to 30-MAY-20 15:26:00 (PST-8)
Location: GOODNOE HILLS
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in KLICKITAT, WASHINGTON
From 30-MAY-20 15:10:00 to 30-MAY-20 15:14:00 (PST-8)
Location: MC CREDIE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in FRANKLIN, WASHINGTON
From 30-MAY-20 17:02:00 to 30-MAY-20 17:06:00 (PST-8)
Location: KAHLOTUS
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in COLUMBIA, WASHINGTON
From 30-MAY-20 17:00:00 to 30-MAY-20 17:05:00 (PST-8)
Location: DAYTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and powerlines down in Dayton.

Thunderstorm Wind in BENTON, WASHINGTON
From 30-MAY-20 16:02:00 to 30-MAY-20 16:07:00 (PST-8)
Location: KENNEWICK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree blocking Kennewick Avenue near Newport Street.

Thunderstorm Wind in BENTON, WASHINGTON
From 30-MAY-20 15:42:00 to 30-MAY-20 15:46:00 (PST-8)
Location: PLYMOUTH
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BENTON, WASHINGTON
From 30-MAY-20 16:00:00 to 30-MAY-20 16:05:00 (PST-8)
Location: PROSSER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Downed trees in Prosser.

Thunderstorm Wind in FRANKLIN, WASHINGTON
From 30-MAY-20 17:00:00 to 30-MAY-20 17:10:00 (PST-8)
Location: JOSO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A small recreational fishing vessel with 3 people on board capsized in rough seas created by a severe thunderstorms on the Snake River. 2 people (one male and one female) were able to make it safely to shore. One male was missing until Sunday morning (5/31)  when he was located deceased by Search and Rescue.

Thunderstorm Wind in WALLA WALLA, WASHINGTON
From 30-MAY-20 16:48:00 to 30-MAY-20 16:53:00 (PST-8)
Location: PRESCOTT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Roof Damage.