A compact, intense line of thunderstorms (derecho) produced multiple reports of straight-line wind damage across central Pennsylvania as it tracked southeast from the northwest mountains into the lower Susquehanna Valley. The line of thunderstorms initiated near Lake Erie shortly after midnight and become stronger and more organized as they moved southeast through the predawn hours before exiting the area around 5am EDT.
A second thunderstorm complex developed in the Ohio Valley later that afternoon and produced large hail and damaging winds across portions of southern Pennsylvania during the evening.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:47:00 to 29-JUN-12 01:47:00 (EST-5)
Location: FILLMORE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in and around Unionville.

Hail in BEDFORD, PENNSYLVANIA
From 29-JUN-12 19:35:00 to 29-JUN-12 19:35:00 (EST-5)
Location: BEEGLETON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in FRANKLIN, PENNSYLVANIA
From 29-JUN-12 20:25:00 to 29-JUN-12 20:25:00 (EST-5)
Location: MERCERSBURG
Magnitude: 0.75 
Reported by: Public

Hail in LANCASTER, PENNSYLVANIA
From 29-JUN-12 21:50:00 to 29-JUN-12 21:50:00 (EST-5)
Location: HAMILTON PARK
Magnitude: 0.88 
Reported by: Public

Thunderstorm Wind in FULTON, PENNSYLVANIA
From 29-JUN-12 19:02:00 to 29-JUN-12 19:02:00 (EST-5)
Location: NEEDMORE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees in Needmore.

Thunderstorm Wind in SOMERSET, PENNSYLVANIA
From 29-JUN-12 19:50:00 to 29-JUN-12 19:50:00 (EST-5)
Location: SOMERSET
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down several trees across the county.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 29-JUN-12 20:25:00 to 29-JUN-12 20:25:00 (EST-5)
Location: MERCERSBURG
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in Mercersburg.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 29-JUN-12 21:05:00 to 29-JUN-12 21:05:00 (EST-5)
Location: TOLAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees in Dickinson Twp.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 29-JUN-12 21:56:00 to 29-JUN-12 21:56:00 (EST-5)
Location: COLUMBIA ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph knocked down trees near Columbia.

Thunderstorm Wind in HUNTINGDON, PENNSYLVANIA
From 29-JUN-12 18:57:00 to 29-JUN-12 18:57:00 (EST-5)
Location: SHADE GAP
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees in Tell Township.

Hail in ADAMS, PENNSYLVANIA
From 29-JUN-12 03:20:00 to 29-JUN-12 03:20:00 (EST-5)
Location: TRUST
Magnitude: 0.88 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail near Caledonia State Park.

Hail in LANCASTER, PENNSYLVANIA
From 29-JUN-12 03:20:00 to 29-JUN-12 03:20:00 (EST-5)
Location: (LNS)LANCASTER ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LANCASTER, PENNSYLVANIA
From 29-JUN-12 03:20:00 to 29-JUN-12 03:20:00 (EST-5)
Location: PENRYN
Magnitude: 1.00 
Reported by: State Official

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:54:00 to 29-JUN-12 01:54:00 (EST-5)
Location: COLEVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Fisherman's Paradise.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:54:00 to 29-JUN-12 01:55:00 (EST-5)
Location: BELLEFONTE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires in and around Bellefonte, including locations such as Bush Addition and Big Spring.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 29-JUN-12 04:00:00 to 29-JUN-12 04:00:00 (EST-5)
Location: STARVIEW
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees near Hallam.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 29-JUN-12 03:22:00 to 29-JUN-12 03:22:00 (EST-5)
Location: PENRYN
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees near Manheim.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:57:00 to 29-JUN-12 01:57:00 (EST-5)
Location: WOODYCREST
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds estimated near 60 mph knocked down trees along I-99/US322 near mile marker 72.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:47:00 to 29-JUN-12 01:47:00 (EST-5)
Location: JULIAN
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Julian.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:52:00 to 29-JUN-12 01:52:00 (EST-5)
Location: BELLEFONTE ARPT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires just east of University Park.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:53:00 to 29-JUN-12 01:53:00 (EST-5)
Location: UNIONVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Valley View.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:56:00 to 29-JUN-12 01:56:00 (EST-5)
Location: FILLMORE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Hunter Park.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 01:57:00 to 29-JUN-12 01:57:00 (EST-5)
Location: AXEMANN
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Axemann.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 02:01:00 to 29-JUN-12 02:01:00 (EST-5)
Location: CENTRE HALL PENNS AR
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Farmers Mills.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 02:03:00 to 29-JUN-12 02:03:00 (EST-5)
Location: CENTRE HALL
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and wires near Old Fort.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 29-JUN-12 02:12:00 to 29-JUN-12 02:12:00 (EST-5)
Location: MILLHEIM
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees and utility wires near Millheim.

Thunderstorm Wind in CLEARFIELD, PENNSYLVANIA
From 29-JUN-12 01:30:00 to 29-JUN-12 01:30:00 (EST-5)
Location: CURWENSVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees in Curwensville, Hyde and Clearfield.

Thunderstorm Wind in DAUPHIN, PENNSYLVANIA
From 29-JUN-12 02:55:00 to 29-JUN-12 02:55:00 (EST-5)
Location: SKYLINE VIEW
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees and bent a 2-inch diameter steel mast on top of an amateur radio tower in Skyline View.

Thunderstorm Wind in DAUPHIN, PENNSYLVANIA
From 29-JUN-12 03:04:00 to 29-JUN-12 03:05:00 (EST-5)
Location: HERSHEY ARPT
Magnitude: 83.00 EG
Property damage: 20.00K
Reported by: NWS Storm Survey

Thunderstorm winds estimated near 95 mph knocked down hundreds of trees and numerous utility wires across Derry and South/East Hanover Townships near Hershey. The trees blocked several roads including sections of Routes 422/322/739/39. The most severely affected areas in Derry Township were the Pat's Hill, Village and Palmdale sections. Two businesses and 8 homes were also damaged, mainly from falling trees. PPL reported about 7,000 people without power. Hershey Gardens was closed due to storm damage. The NWS conducted an official storm survey with the Derry Township Police and confirmed a macroburst. The macroburst, straight-line wind event with estimated highest wind gusts to 95 mph (EF1 wind strength) was determined to have occurred over a broad area more than 3 miles wide just north of Hershey Park in Derry Township. The tree damage had mostly a north to south or NW to SE orientation. A notable destruction location included the area from Union Deposit in South Hanover township southeastward to the Swatara Creek where a house roof was lifted off and over 50 trees were damaged or destroyed. Another impressive damage location was found just west of the Hotel Hershey complex where a grove of tall pines were snapped or uprooted. There were scattered trees down throughout the area including those which fell onto structures in town. Throughout the area from 200 to 300 trees were estimated to have been damaged or downed including about 60 trees on the golf course according to the golf course manager. Within Hershey Park, the football stadium was set up for a Dave Matthews band concert for the evening. The protective field pads were all ripped up in the early morning wind gusts a strewn throughout the stadium.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 29-JUN-12 03:45:00 to 29-JUN-12 03:45:00 (EST-5)
Location: LEHMAN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

Thunderstorm winds estimated near 60 mph knocked down trees near Spring Grove.

Thunderstorm Wind in PERRY, PENNSYLVANIA
From 29-JUN-12 02:29:00 to 29-JUN-12 02:29:00 (EST-5)
Location: NEWPORT
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down trees in Newport.

Hail in BEDFORD, PENNSYLVANIA
From 29-JUN-12 18:45:00 to 29-JUN-12 18:45:00 (EST-5)
Location: MATTIE
Magnitude: 1.00 
Reported by: Public

Hail in FULTON, PENNSYLVANIA
From 29-JUN-12 19:00:00 to 29-JUN-12 19:00:00 (EST-5)
Location: SIDELING HILL
Magnitude: 1.75 
Reported by: Public

Hail in FULTON, PENNSYLVANIA
From 29-JUN-12 19:05:00 to 29-JUN-12 19:05:00 (EST-5)
Location: SIDELING HILL
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 29-JUN-12 22:15:00 to 29-JUN-12 22:15:00 (EST-5)
Location: NARVON
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down a large 30-inch diameter tree near Narvon.