A cold front triggered multiple severe thunderstorms that produced large hail and damaging winds over the south-central mountains and lower Susquehanna Valley during the afternoon and evening hours. The largest hailstones were estimated at two inches in diameter. The large hail caused significant damage and crop loss over the lower Susquehanna Valley, but the total acreage and dollar amount of the losses are unknown. The USDA issued a Disaster Declaration for the crop loss resulting from the hail in York, Adams, Cumberland, Dauphin and Lancaster counties.

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: SPRY
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:20:00 to 14-MAY-10 17:20:00 (EST-5)
Location: DALLASTOWN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:20:00 to 14-MAY-10 17:20:00 (EST-5)
Location: SPRY
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:22:00 to 14-MAY-10 17:22:00 (EST-5)
Location: WINDSOR
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: MILLERSVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in SOMERSET, PENNSYLVANIA
From 14-MAY-10 15:40:00 to 14-MAY-10 15:40:00 (EST-5)
Location: GRAY
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAUPHIN, PENNSYLVANIA
From 14-MAY-10 15:35:00 to 14-MAY-10 15:35:00 (EST-5)
Location: ELIZABETHVILLE
Magnitude: 0.75 
Reported by: Trained Spotter

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 14-MAY-10 19:00:00 to 14-MAY-10 19:00:00 (EST-5)
Location: GATESBURG
Magnitude: 78.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A survey team from the National Weather Service investigated thunderstorm wind damage that began near the intersection of Tadpole and Marengo Roads and continued east for about 3.5 miles. The damage varied in width from about 1 mile wide at the start of the damage swath and narrowed to about 200 yards. 70 to 100 trees were blown down. Several barns and out-buildings sustained roof damage and four homes were damaged by falling trees. The homes also sustained siding and shingle damage. The most significant and concentrated tree damage occurred along an just east of Pine Hollow Road. Based on the damage to the trees and structures, the National Weather Service confirmed a macroburst with estimated maximum winds between 80 and 90 mph.

Thunderstorm Wind in FRANKLIN, PENNSYLVANIA
From 14-MAY-10 16:30:00 to 14-MAY-10 16:30:00 (EST-5)
Location: GUILFORD SPG
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds estimated between 60 and 70 mph produced a swath of sporadic damage a few miles south of Chambersburg, starting near the intersection of Route 11 and Kriner Road and continued eastward across Tower Road, Orchard Drive and Nitterhaus Drive. The damaging winds knocked down several trees and large limbs and flipped-over two semi-box trailers.

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 14-MAY-10 14:20:00 to 14-MAY-10 14:20:00 (EST-5)
Location: CANAN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm winds estimated near 60 mph downed trees and wires near Altoona. Several power outages were also reported.

Hail in CAMBRIA, PENNSYLVANIA
From 14-MAY-10 14:45:00 to 14-MAY-10 14:45:00 (EST-5)
Location: BELMONT
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:00:00 to 14-MAY-10 17:00:00 (EST-5)
Location: MANCHESTER
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 14-MAY-10 16:55:00 to 14-MAY-10 16:55:00 (EST-5)
Location: CASHTOWN
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds were estimated near 60 mph.

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 17:05:00 to 14-MAY-10 17:05:00 (EST-5)
Location: MOUNTVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: WEST LANCASTER
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 16:57:00 to 14-MAY-10 16:57:00 (EST-5)
Location: BAINBRIDGE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 16:57:00 to 14-MAY-10 16:57:00 (EST-5)
Location: HALLAM
Magnitude: 1.75 
Property damage: 1.00K
Reported by: Trained Spotter

Golfball size hail shattered a car window in Hallam.

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 17:00:00 to 14-MAY-10 17:00:00 (EST-5)
Location: COLUMBIA
Magnitude: 0.88 
Reported by: Public

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 16:45:00 to 14-MAY-10 16:45:00 (EST-5)
Location: STARVIEW
Magnitude: 2.00 
Reported by: Public

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 16:50:00 to 14-MAY-10 16:50:00 (EST-5)
Location: MARIETTA AFS
Magnitude: 1.25 
Reported by: Trained Spotter

Thunderstorm Wind in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:10:00 to 14-MAY-10 16:10:00 (EST-5)
Location: CARLISLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph toppled trees near Carlisle.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 14-MAY-10 16:45:00 to 14-MAY-10 16:45:00 (EST-5)
Location: MANCHESTER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds estimated near 60 mph downed trees and wires a few miles west of Mount Wolf.

Hail in FRANKLIN, PENNSYLVANIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: EDENVILLE
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:10:00 to 14-MAY-10 16:10:00 (EST-5)
Location: MECHANICSBURG
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:15:00 to 14-MAY-10 16:15:00 (EST-5)
Location: HOCKERSVILLE
Magnitude: 2.00 
Reported by: Public

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:19:00 to 14-MAY-10 16:19:00 (EST-5)
Location: MECHANICSBURG
Magnitude: 1.75 
Reported by: Public

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 16:40:00 to 14-MAY-10 16:40:00 (EST-5)
Location: CLY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 16:52:00 to 14-MAY-10 16:52:00 (EST-5)
Location: WRIGHTSVILLE
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 16:55:00 to 14-MAY-10 16:55:00 (EST-5)
Location: WRIGHTSVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 16:57:00 to 14-MAY-10 16:57:00 (EST-5)
Location: MARIETTA AFS
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 15:55:00 to 14-MAY-10 15:55:00 (EST-5)
Location: CARLISLE
Magnitude: 1.00 
Reported by: Public

Hail in LANCASTER, PENNSYLVANIA
From 14-MAY-10 16:45:00 to 14-MAY-10 16:45:00 (EST-5)
Location: BAINBRIDGE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 15:56:00 to 14-MAY-10 15:56:00 (EST-5)
Location: CARLISLE
Magnitude: 1.25 
Reported by: Public

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:00:00 to 14-MAY-10 16:00:00 (EST-5)
Location: CARLISLE
Magnitude: 1.25 
Reported by: Public

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:01:00 to 14-MAY-10 16:01:00 (EST-5)
Location: CARLISLE
Magnitude: 1.25 
Reported by: Public

Hail in CUMBERLAND, PENNSYLVANIA
From 14-MAY-10 16:02:00 to 14-MAY-10 16:02:00 (EST-5)
Location: CARLISLE
Magnitude: 1.75 
Reported by: Public

Thunderstorm Wind in CENTRE, PENNSYLVANIA
From 14-MAY-10 19:08:00 to 14-MAY-10 19:08:00 (EST-5)
Location: PINE GROVE MILLS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds estimated near 60 mph downed a few trees and tore shingles and siding off of a house in Pine Grove Mills.

Thunderstorm Wind in CAMBRIA, PENNSYLVANIA
From 14-MAY-10 14:47:00 to 14-MAY-10 14:47:00 (EST-5)
Location: JOHNSTOWN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds estimated near 60 mph downed trees, large limbs and power lines in Johnstown.

Hail in BLAIR, PENNSYLVANIA
From 14-MAY-10 14:55:00 to 14-MAY-10 14:55:00 (EST-5)
Location: ROARING SPG
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HUNTINGDON, PENNSYLVANIA
From 14-MAY-10 14:45:00 to 14-MAY-10 14:45:00 (EST-5)
Location: SNYDERTOWN
Magnitude: 74.00 MG
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds measured 85 mph at the Seven Points Visitors Center near Raystown Lake.

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 17:30:00 to 14-MAY-10 17:30:00 (EST-5)
Location: HANOVER
Magnitude: 0.88 
Reported by: Trained Spotter

Thunderstorm Wind in LANCASTER, PENNSYLVANIA
From 14-MAY-10 17:45:00 to 14-MAY-10 17:45:00 (EST-5)
Location: WAKEFIELD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph toppled multiple trees and wires between Quarryville and Wakefield.

Hail in YORK, PENNSYLVANIA
From 14-MAY-10 18:00:00 to 14-MAY-10 18:00:00 (EST-5)
Location: NEW FREEDOM
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in BLAIR, PENNSYLVANIA
From 14-MAY-10 18:42:00 to 14-MAY-10 18:42:00 (EST-5)
Location: TYRONE
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BLAIR, PENNSYLVANIA
From 14-MAY-10 14:55:00 to 14-MAY-10 14:55:00 (EST-5)
Location: MARTINSBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds estimated near 60 mph caused roof damage to a house near Martinsburg.