Shortwave passage along a sagging boundary resulted in showers and thunderstorms across the region on the 15th. With plenty of instability and unidirectional shear, the primary threat was damaging wind although there were several hail reports as well.

Hail in BEAVER, PENNSYLVANIA
From 15-MAY-18 11:06:00 to 15-MAY-18 11:06:00 (EST-5)
Location: WEST MAYFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in BUTLER, PENNSYLVANIA
From 15-MAY-18 11:24:00 to 15-MAY-18 11:24:00 (EST-5)
Location: RENFREW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLARION, PENNSYLVANIA
From 15-MAY-18 11:36:00 to 15-MAY-18 11:36:00 (EST-5)
Location: SHANNONDALE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Hail in JEFFERSON, PENNSYLVANIA
From 15-MAY-18 11:45:00 to 15-MAY-18 11:45:00 (EST-5)
Location: COOLSPRING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, PENNSYLVANIA
From 15-MAY-18 11:59:00 to 15-MAY-18 11:59:00 (EST-5)
Location: SOLDIER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in INDIANA, PENNSYLVANIA
From 15-MAY-18 12:07:00 to 15-MAY-18 12:07:00 (EST-5)
Location: HILLSDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in INDIANA, PENNSYLVANIA
From 15-MAY-18 12:09:00 to 15-MAY-18 12:09:00 (EST-5)
Location: COMMODORE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, PENNSYLVANIA
From 15-MAY-18 12:20:00 to 15-MAY-18 12:20:00 (EST-5)
Location: SYKESVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 15-MAY-18 10:56:00 to 15-MAY-18 10:56:00 (EST-5)
Location: CROWN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

State official reported trees down in Farmington Township.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 15-MAY-18 11:11:00 to 15-MAY-18 11:11:00 (EST-5)
Location: COOKSBURG
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Department of Highways

State Department of Highways reported trees down on Cemetery Road.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 15-MAY-18 11:12:00 to 15-MAY-18 11:12:00 (EST-5)
Location: OGLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Newspaper

Local newspaper reported trees and a utility pole down.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 15-MAY-18 11:13:00 to 15-MAY-18 11:13:00 (EST-5)
Location: CLARINGTON
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Department of Highways reported trees down on Greenwald Road.

Thunderstorm Wind in FOREST, PENNSYLVANIA
From 15-MAY-18 11:15:00 to 15-MAY-18 11:15:00 (EST-5)
Location: COOKSBURG
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Department of Highways reported trees down on River Road.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 15-MAY-18 11:27:00 to 15-MAY-18 11:27:00 (EST-5)
Location: LEATHERWOOD
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

State official reported trees down on State Route 861.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 15-MAY-18 11:30:00 to 15-MAY-18 11:30:00 (EST-5)
Location: MIDDLE RUN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

National Weather Service Employee reported trees down at Champion Road and Route 66.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 15-MAY-18 11:30:00 to 15-MAY-18 11:30:00 (EST-5)
Location: SHANNONDALE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

State official reported trees down in Redbank Township.

Thunderstorm Wind in INDIANA, PENNSYLVANIA
From 15-MAY-18 12:15:00 to 15-MAY-18 12:15:00 (EST-5)
Location: MARION CENTER
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: State Official

State official reported utility lines down along Pierce Hollow Road.