A dynamic area of low pressure and trailing frontal zone moved across southeastern Pennsylvania during the late afternoon and evening, producing intense lines of heavy showers and thunderstorms. Deep moisture and very strong wind fields ahead of the frontal system produced torrential rains, flash flooding and localized wind damage across the Lower Susquehanna Valley.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 16-APR-11 19:05:00 to 16-APR-11 19:05:00 (EST-5)
Location: WEST MANHEIM
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 and damaged a house in West Manheim.

Thunderstorm Wind in ADAMS, PENNSYLVANIA
From 16-APR-11 15:55:00 to 16-APR-11 15:55:00 (EST-5)
Location: ABBOTTSTOWN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

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

Thunderstorm Wind in YORK, PENNSYLVANIA
From 16-APR-11 19:25:00 to 16-APR-11 19:25:00 (EST-5)
Location: YORK
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds estimated near 60 mph knocked down multiple trees and utility wires in and around the city of York.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 16-APR-11 19:30:00 to 16-APR-11 19:30:00 (EST-5)
Location: SHREWSBURY
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 and utility wires near Shrewsbury.

Thunderstorm Wind in YORK, PENNSYLVANIA
From 16-APR-11 19:20:00 to 16-APR-11 19:20:00 (EST-5)
Location: FRANKLINTOWN
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 and utility wires along SR 74 in Warrington Township.

Flash Flood in DAUPHIN, PENNSYLVANIA
From 16-APR-11 17:45:00 to 16-APR-11 23:30:00 (EST-5)
Location: PLEASANT HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very heavy, short duration rainfall resulted in small stream flooding and several road closures near Linglestown.

Flash Flood in SCHUYLKILL, PENNSYLVANIA
From 16-APR-11 18:30:00 to 16-APR-11 23:30:00 (EST-5)
Location: TOWER CITY ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The 911 center reported three flooded roadways in the Tower City and St. Clair areas.

Flash Flood in LEBANON, PENNSYLVANIA
From 16-APR-11 19:00:00 to 16-APR-11 23:30:00 (EST-5)
Location: ANNVILLE MILLARD ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfall in a short period of time resulted in Quittaphilla Creek flooding from 22nd Street in Lebanon to Route 442 in Annville.

Flash Flood in YORK, PENNSYLVANIA
From 16-APR-11 22:00:00 to 16-APR-11 23:30:00 (EST-5)
Location: ANDERSONTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding resulted in a water rescue in Fairview Township.

Flash Flood in CUMBERLAND, PENNSYLVANIA
From 16-APR-11 16:00:00 to 16-APR-11 21:30:00 (EST-5)
Location: CARLISLE SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding resulted in 12 water rescues of people in cars on flooded roads at several locations.  Cedar Run was reported out of banks and flooding Old Gettysburg Road near Shiremanstown.

Flash Flood in ADAMS, PENNSYLVANIA
From 16-APR-11 16:25:00 to 17-APR-11 03:00:00 (EST-5)
Location: WENKSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous water rescues of stranded motorists were made by boats and helicopters. No injuries were reported but several people were taken to area hospitals for evaluation. Several residences were evacuated due to high waters along area creeks. The Gettysburg Fire Department, assisted by several local fire departments, evacuated 27 boy scouts via boat from the Gettysburg Campground. The boy scouts were relocated to the Eisenhower Inn. SR 94 was closed due to high water in Reading Township. Helicopters used in rescue operations were provided by Troop 3 of Maryland State Police and Stat Medivac from Thomasville, York County, PA. Opossum Creek was also out of its banks.

Flash Flood in FRANKLIN, PENNSYLVANIA
From 16-APR-11 18:00:00 to 16-APR-11 22:00:00 (EST-5)
Location: ANBERSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash flooding was widespread across the area.  Some reports included flooding at Falling Spring Creek at Kennedy Street and 5th Avenue in Chambersburg as well as the   intersection of Hickory Run Road and Orestown Road.  A water rescue was reported in Southhampton Township.  Also in Chambersburg, Conococheague Creek was flooded at Commerce Street.  Roads were flooded and closed in Letterkenny and Lurgan Townships.  Iron Bridge Road was reported flooded at the Confluence of the West and East Branch of Antietam Creek near Waynesboro.