A warm front lifted north across the upper Ohio Valley spreading warm and moist air across the region.  Strong to severe thunderstorms developed in association with this front.  A couple of the thunderstorms became severe.  Two tornadoes occurred in  southern Erie County and caused some damage.  A motorcyclist hit a downed tree in western Crawford County and died from his injuries.
A second wave of thunderstorms occurred during the evening of the 29th as the warm front lingered over the region.  A thunderstorm became severe in Crawford County and caused some damage.

Hail in CRAWFORD, PENNSYLVANIA
From 29-MAY-13 15:39:00 to 29-MAY-13 15:39:00 (EST-5)
Location: HARTSTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was observed.

Hail in CRAWFORD, PENNSYLVANIA
From 29-MAY-13 15:41:00 to 29-MAY-13 15:41:00 (EST-5)
Location: TURNERSVILLE
Magnitude: 1.25 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Half dollar sized hail was observed.  Some damage to vehicles occurred.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 29-MAY-13 15:41:00 to 29-MAY-13 15:41:00 (EST-5)
Location: TURNERSVILLE
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed three trees and several large limbs.  A cabin was damaged by a fallen tree.

Tornado in ERIE, PENNSYLVANIA
From 28-MAY-13 18:53:00 to 28-MAY-13 19:20:00 (EST-5)
Location: EDINBORO
Tornado F-scale: EF1
Property damage: 300.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A second tornado touched down about two miles north of Edinboro.  This tornado then traveled east to Union city and finally lifted about three miles southeast of the town.  The tornado appears to have been on the ground only intermittently.  The damage path was almost 18 miles in length and up to 150 yards in width.  The tornado caused considerable tree damage in Union City.  Trees were uprooted and multiple trees fell on homes causing additional damage.  Some of the uprooted trees damaged road surfaces.  The strong winds from the tornado also caused damage to roofs and siding.   A building along Main Street lost it's brick facade.   A couple of homes west of Union City lost large sections of roofing.  A couple of farm buildings were also damaged.  Damage elsewhere along the damage path consisted of mainly downed trees.  Peak winds were estimated around 105 mph making this an EF1 tornado.  Two minor injuries were reported.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 28-MAY-13 19:45:00 to 28-MAY-13 19:45:00 (EST-5)
Location: ADAMSVILLE
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds downed a large tree on Adamsville Road between Jamestown and Adamsville.  A motorcyclist hit the downed tree just before 9 pm and sustained fatal injuries.

Thunderstorm Wind in CRAWFORD, PENNSYLVANIA
From 29-MAY-13 15:40:00 to 29-MAY-13 15:40:00 (EST-5)
Location: CAMBRIDGE SPGS
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm winds downed at least six trees.  A couple of the fallen trees damaged houses.

Tornado in ERIE, PENNSYLVANIA
From 28-MAY-13 18:35:00 to 28-MAY-13 18:40:00 (EST-5)
Location: IVAREA
Tornado F-scale: EF1
Property damage: 75.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A supercell thunderstorm produced two tornadoes in Erie County.  The first tornado touched down about two miles northeast of Cranesville.  The tornado was on the ground for over a mile and a half and downed many trees.  A mobile home was also overturned and destroyed.  Five people inside the mobile home were injured.  A couple of farm buildings were also heavily damaged.   Peak winds were estimated to be around 90 mph making it an EF1 on the Enhanced Fujita scale.  The damage path was no more than 50 yards wide.