A frontal boundary oriented west-east across northwest Pennsylvania was the focus for the development of numerous showers and thunderstorms on May 26. During the afternoon hours on the 26th, the boundary slowly retreated north as a cold front approached the region. Showers and severe thunderstorms developed during the afternoon hours and lasted for several hours. A strong surge of warm, moist air from the gulf region allowed for thunderstorms to produce significant amounts of rainfall across the area.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 26-MAY-11 15:50:00 to 26-MAY-11 15:50:00 (EST-5)
Location: SPRINGBORO
Magnitude: 50.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed several large trees. Roofs were also blown off some buildings.

Tornado in CRAWFORD, PENNSYLVANIA
From 26-MAY-11 15:40:00 to 26-MAY-11 15:51:00 (EST-5)
Location: BEAVER CENTER
Tornado F-scale: EF1
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF1 tornado touched down west of Springboro near the Ohio/Pennsylvania state line.  The tornado initially touched down near the intersection of Artman and Reeds Corner Roads.  The tornado then continued northeast on the ground for just over six and a half miles before lifting near Angling Road to the north of Springboro.  Around ten homes and buildings were damaged along the damage path which was no more than 100 yards in width.  Most of the damage was from lost roofing or siding.  Many trees were also downed along the damage path.

Hail in ERIE, PENNSYLVANIA
From 26-MAY-11 16:01:00 to 26-MAY-11 16:07:00 (EST-5)
Location: ALBION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms produced a swath of penny to quarter size hail.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 26-MAY-11 00:00:00 to 26-MAY-11 00:00:00 (EST-5)
Location: MEADVILLE
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed several large trees across the county.

Thunderstorm Wind in ERIE, PENNSYLVANIA
From 26-MAY-11 15:50:00 to 26-MAY-11 15:50:00 (EST-5)
Location: ALBION
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm winds downed several large trees and doors were blown off buildings. The tops of a few large trees were snapped off.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 26-MAY-11 19:55:00 to 26-MAY-11 19:55:00 (EST-5)
Location: SPRINGBORO
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed numerous large trees along Route 18.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 26-MAY-11 19:50:00 to 26-MAY-11 19:50:00 (EST-5)
Location: BEAVER CENTER
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds snapped a large tree. Skirting was blown off a mobile home and a 2X4 was blown through a barn wall.

Hail in ERIE, PENNSYLVANIA
From 26-MAY-11 16:35:00 to 26-MAY-11 16:35:00 (EST-5)
Location: WATTSBURG
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced nickel size hail.

Hail in ERIE, PENNSYLVANIA
From 26-MAY-11 17:20:00 to 26-MAY-11 17:24:00 (EST-5)
Location: ERIE
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced quarter size hail.