A strong progressive shortwave trough over the Upper MS valley tracked southeastward into the OH valley and Central Appalachians. Rather strong large scale forcing for ascent and destabilization occurred ahead of the trough, resulting a large area of severe weather of central PA. Moderate instability coupled with cool temperatures aloft (steep lapse rates) and favorable effective shear profiles sponsored organized storm/supercell structures which produced several reports of damaging winds.

Hail in CUMBERLAND, PENNSYLVANIA
From 27-JUL-14 17:35:00 to 27-JUL-14 17:35:00 (EST-5)
Location: SHIREMANSTOWN
Magnitude: 0.88 
Reported by: Trained Spotter

Nickel size hail (0.88 inch diameter) was reported in Shiremanstown.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 27-JUL-14 17:35:00 to 27-JUL-14 17:35:00 (EST-5)
Location: MECHANICSBURG
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 27-JUL-14 17:35:00 to 27-JUL-14 17:35:00 (EST-5)
Location: MECHANICSBURG
Magnitude: 56.00 EG
Reported by: Trained Spotter

Spotter reported estimated thunderstorm wind gust of 65 mph in Shiremanstown.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 27-JUL-14 17:37:00 to 27-JUL-14 17:37:00 (EST-5)
Location: ROARING SPG
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

Thunderstorm winds estimated near 60 mph knocked down trees and wires in Roaring Spring.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 27-JUL-14 17:45:00 to 27-JUL-14 17:45:00 (EST-5)
Location: ROSSMOYNE
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down numerous trees and wires east of Shiremanstown.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 27-JUL-14 17:45:00 to 27-JUL-14 17:45:00 (EST-5)
Location: HOLIDAYSBURG
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees in and around Hollidaysburg.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 27-JUL-14 17:48:00 to 27-JUL-14 17:48:00 (EST-5)
Location: MILL RUN
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees in and around Altoona.

Thunderstorm Wind in LEBANON, PENNSYLVANIA
From 27-JUL-14 18:25:00 to 27-JUL-14 18:25:00 (EST-5)
Location: FONTANA
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 2.00K
Reported by: NWS Storm Survey

A survey team confirmed a microburst in South Annville Township around 1925 EDT. The straight line wind damage was most concentrated just north of U.S. 322 from Mt. Pleasant Road to SR 934 (S. White Oak Street). The damage consisted of a portion of a metal roof off a farm house, minor structural damage to several farm/outbuildings, one utility pole down, crop damage to corn fields and numerous trees snapped off or knocked down. Based on the damage surveyed, the maximum thunderstorm winds were estimated at 80 mph. The maximum path width was approximately 50 yards with damage spread out (sporadically) along a 2 mile path.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 27-JUL-14 18:30:00 to 27-JUL-14 18:30:00 (EST-5)
Location: STATE COLLEGE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: NWS Employee

Thunderstorm winds estimated near 60 mph knocked down trees in State College.

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 27-JUL-14 19:30:00 to 27-JUL-14 19:30:00 (EST-5)
Location: SMOKETOWN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds estimated near 60 mph knocked down trees at Dutch Wonderland amusement park.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 27-JUL-14 17:30:00 to 27-JUL-14 17:30:00 (EST-5)
Location: CLAYSBURG
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 27-JUL-14 17:35:00 to 27-JUL-14 17:35:00 (EST-5)
Location: ROARING SPG
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and wires in Roaring Spring.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 27-JUL-14 18:25:00 to 27-JUL-14 18:25:00 (EST-5)
Location: PINE GROVE MILLS
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

Thunderstorm winds estimated near 60 mph knocked down trees and wires in Pine Grove Mills.

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 27-JUL-14 18:45:00 to 27-JUL-14 18:45:00 (EST-5)
Location: BELLEFONTE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in YORK, PENNSYLVANIA
From 27-JUL-14 19:00:00 to 27-JUL-14 19:00:00 (EST-5)
Location: WRIGHTSVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Broadcast Media

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

Hail in HUNTINGDON, PENNSYLVANIA
From 27-JUL-14 16:26:00 to 27-JUL-14 16:26:00 (EST-5)
Location: MC CONNELLSTOWN
Magnitude: 1.00 
Reported by: Social Media

Quarter size hail (1 inch diameter) was reported in Mcconnellstown.

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 27-JUL-14 16:30:00 to 27-JUL-14 16:30:00 (EST-5)
Location: BLOSERVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: 911 Call Center

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