Showers and thunderstorms, some of which where severe, developed in a rather unstable environment with modest shear, in the afternoon and evening of the 28th. Focus for storms was along a warm front, where slow moving/training cells produced heavy rain approaching 3 inches in several areas in the vicinity of Interstate 80. Flash Flooding was reported in Venango and Clarion counties in Pennsylvania, with additional flooding reported overnight in Indiana county as another round of storms approached with the nearing cold front.

Hail in CLARION, PENNSYLVANIA
From 28-MAY-17 15:04:00 to 28-MAY-17 15:04:00 (EST-5)
Location: KNOX
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VENANGO, PENNSYLVANIA
From 28-MAY-17 15:34:00 to 28-MAY-17 15:34:00 (EST-5)
Location: NICKLEVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLARION, PENNSYLVANIA
From 28-MAY-17 15:45:00 to 28-MAY-17 15:45:00 (EST-5)
Location: PAINT MILLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in CLARION, PENNSYLVANIA
From 28-MAY-17 16:25:00 to 28-MAY-17 17:45:00 (EST-5)
Location: CLARION CO ARPT
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported fast moving water. Several roads north of Clarion were flooded. Route 322 was closed from the intersection at Route 66 to Liberty Street in Clarion Boro. Also, Toby Hill Bridge was closed due to flash flooding.

Flood in CLARION, PENNSYLVANIA
From 28-MAY-17 18:17:00 to 28-MAY-17 20:30:00 (EST-5)
Location: CLARION PARKER ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

State official reported Route 322 and North 5th street were closed due to flooding.

Flood in MERCER, PENNSYLVANIA
From 28-MAY-17 20:19:00 to 28-MAY-17 23:00:00 (EST-5)
Location: GREENVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported many roads closed around the city of Greenville due to high water. Some debris was scattered across several roads.

Flood in INDIANA, PENNSYLVANIA
From 29-MAY-17 01:31:00 to 29-MAY-17 10:00:00 (EST-5)
Location: CHERRY TREE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

State official reported flooding of several roads in Cherry Tree including Front Stree, State Route 580, and US 219.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 28-MAY-17 15:49:00 to 28-MAY-17 15:49:00 (EST-5)
Location: CLARION PARKER ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

State official reported many trees and wires down.

Heavy Rain in CLARION, PENNSYLVANIA
From 28-MAY-17 17:29:00 to 28-MAY-17 17:29:00 (EST-5)
Location: KNOX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in JEFFERSON, PENNSYLVANIA
From 28-MAY-17 18:15:00 to 28-MAY-17 18:15:00 (EST-5)
Location: BROOKVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in CLARION, PENNSYLVANIA
From 28-MAY-17 19:48:00 to 28-MAY-17 19:48:00 (EST-5)
Location: SHIPPENVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in CLARION, PENNSYLVANIA
From 28-MAY-17 22:42:00 to 28-MAY-17 22:42:00 (EST-5)
Location: FROGTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported as a storm total.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 28-MAY-17 15:20:00 to 28-MAY-17 15:20:00 (EST-5)
Location: SHIPPENVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Manager reported multiple trees down around the city of Shippenville.

Flood in INDIANA, PENNSYLVANIA
From 29-MAY-17 07:38:00 to 29-MAY-17 10:00:00 (EST-5)
Location: SAVAN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

State official reported roads around and including US 199 flooded. Also, a vehicle was stranded on West Creek Road in North Mahoning Township.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 28-MAY-17 15:45:00 to 28-MAY-17 15:45:00 (EST-5)
Location: CLARION PARKER ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported multiple trees down around the city of Clarion.

Thunderstorm Wind in CLARION, PENNSYLVANIA
From 28-MAY-17 15:58:00 to 28-MAY-17 15:58:00 (EST-5)
Location: STRATTANVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported minor damage to house siding.

Flash Flood in VENANGO, PENNSYLVANIA
From 28-MAY-17 16:55:00 to 28-MAY-17 17:30:00 (EST-5)
Location: HANNASVILLE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Local 911 reported several roads closed due to flash flooding around Cooperstown including Route 427, Route 428, and parts of Route 322 toward the Mercer county line.

Flood in INDIANA, PENNSYLVANIA
From 29-MAY-17 02:48:00 to 29-MAY-17 10:00:00 (EST-5)
Location: WANDIN JCT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

State official reported that Wandin Road and State Route 286 were flooding in Green Township.