Thunderstorms developed ahead of a cold front advancing eastward through the Ohio Valley. The storms produced isolated wind damage and several areas of locally heavy rainfall from the late afternoon hours through the overnight period. Torrential downpours prompted numerous reports of flash flooding.

Flash Flood in WARREN, PENNSYLVANIA
From 28-MAY-09 17:30:00 to 28-MAY-09 20:00:00 (EST-5)
Location: WARREN
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain from thunderstorms caused flash flooding in the city of Warren, eastward to near the Kinzua Dam. A rock slide was reported along Route 59 about 1 mile west of Kinzua Dam. Several flooded roads were also noted in and around the city of Warren.

Flash Flood in MCKEAN, PENNSYLVANIA
From 28-MAY-09 19:00:00 to 29-MAY-09 00:15:00 (EST-5)
Location: BRADFORD
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

Heavy rain caused flash flooding throughout much of northeast and east-central McKean County. Flooding was reported along Route 6, Route 46 and Route 155. Flooding was especially noted in the towns of Smethport, Port Allegheny and Marvindale, with roads closed and some basement flooding. In Port Allegany, the Medberry Manor Assisted Living Facility was evacuated as a result of flooding.

Flash Flood in HUNTINGDON, PENNSYLVANIA
From 28-MAY-09 17:30:00 to 28-MAY-09 22:00:00 (EST-5)
Location: COLFAX
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several thunderstorms with heavy rain caused flash flooding in central portions of Huntingdon County. In Smithfield and Juniata Townships, there was a report of a 200 yard wide area of geological subsidence due to a rockslide. Numerous roads were flooded and closed, with basement flooding and some road erosion. Route 22 was flooded. Two bridges were impacted with debris. The debris caused a diversion of a stream into a home which suffered moderate damages. Numerous road closures and basement flooding was also reported in Walker and Union townships. In Walker Township, Hartslog Valley Road, Station Road, Pond Road and Route 26 were closed due to flooding. In total, about 120 homes reported basement flooding.

Flood in PERRY, PENNSYLVANIA
From 29-MAY-09 02:59:00 to 29-MAY-09 08:45:00 (EST-5)
Location: BLAIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain from thunderstorms caused extensive flash flooding across central and western portions of Perry County. Numerous roads were flooded throughout the county, including Route 233, Route 850, Route 274, Route 34 and Route 74. Approximately 25 to 30 homes along Sherman Creek were evacuated due to rising flood waters. Five water rescues were performed. Over 100 basements were flooded. Much of the flooding occurred between Landisburg and Loysville. The flash flood event transitioned into a flood event, which lasted into the mid morning hours before waters receded.

Flood in PERRY, PENNSYLVANIA
From 29-MAY-09 00:32:00 to 29-MAY-09 09:24:00 (EST-5)
Location: SHERMANS DALE
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain in the headwaters of Sherman Creek caused a sharp rise along the creek, and eventually lead to moderate flooding. A rise of nearly 12 feet in less than 6 hours was the result of between 5 and 7 inches of rain falling over a portion of the basin. Evacuations of 25 to 30 homes occurred along Sherman Creek due to the rising flood waters. Several homes were isolated due to flood waters, and some sustained flooding (basements, workshops). Flood waters rapidly subsided by late morning.

Flash Flood in PERRY, PENNSYLVANIA
From 28-MAY-09 21:20:00 to 29-MAY-09 02:59:00 (EST-5)
Location: BLAIN
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain from thunderstorms caused extensive flash flooding across central and western portions of Perry County. Numerous roads were flooded throughout the county, including Route 233, Route 850, Route 274, Route 34 and Route 74. Approximately 25 to 30 homes along Sherman Creek were evacuated due to rising flood waters. Five water rescues were performed. Over 100 basements were flooded. Much of the flooding occurred between Landisburg and Loysville.

Flash Flood in CUMBERLAND, PENNSYLVANIA
From 28-MAY-09 22:40:00 to 29-MAY-09 02:59:00 (EST-5)
Location: NEWBURG
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms produced heavy rain and flash flooding in northern portions of Cumberland County. Roads were closed in Upper and Lower Mifflin Township. A rock slide occurred along Route 233 southwest of Colonel Denning State Park. Campers were also evacuated from the Park. In the vicinity of Doubling Gap Creek, several roads were also closed.

Flood in CUMBERLAND, PENNSYLVANIA
From 29-MAY-09 02:59:00 to 29-MAY-09 08:45:00 (EST-5)
Location: NEWBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms produced heavy rain and flash flooding in northern portions of Cumberland County. Roads were closed in Upper and Lower Mifflin Township. A rock slide occurred along Route 233 southwest of Colonel Denning State Park. Campers were also evacuated from the Park. In the vicinity of Doubling Gap Creek, several roads were also closed. The flash flood event transitioned into a flood event, which lasted into the mid morning hours before waters receded.

Thunderstorm Wind in WARREN, PENNSYLVANIA
From 28-MAY-09 15:32:00 to 28-MAY-09 15:32:00 (EST-5)
Location: BEAR LAKE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated around 60 mph knocked down trees near Bear Lake.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 28-MAY-09 17:40:00 to 28-MAY-09 17:40:00 (EST-5)
Location: PORTAGE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated around 60 mph uprooted or broke off several trees and limbs in Portage Borough. Two homes, vehicles and fences all sustained damage. The also winds knocked down wires causing isolated power outages.