A strong cold frontal passage triggered strong to severe thunderstorms from the Lehigh Valley southeast into the greater Philadelphia Metropolitan area on the afternoon of the 25th. About 60,000 homes and businesses lost power, with the greatest concentration in Lehigh County in the Lehigh Valley and Chester County in southeastern Pennsylvania. It took up to 24 hours for all power to be restored. One lightning related injury occurred in Montgomery County.

Thunderstorm Wind in BUCKS, PENNSYLVANIA
From 25-JUL-10 13:46:00 to 25-JUL-10 14:34:00 (EST-5)
Location: SPRINGTOWN
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down several trees in northeastern and eastern Bucks County. Trees were knocked down in both directions on Pennsylvania State Route 32 in Yardley Borough and in Lower Makefield Township. The roadway was blocked into the 26th in Lower Makefield Township. Two downed trees also crushed two vehicles. No injuries were reported. Both Bucks and Chester Counties took the brunt of the power outages (45,000) in PECO Energy's service area.

Thunderstorm Wind in PHILADELPHIA, PENNSYLVANIA
From 25-JUL-10 14:40:00 to 25-JUL-10 14:48:00 (EST-5)
Location: SHAWMONT
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A severe thunderstorm tore down trees and signs in Philadelphia. In the Torresdale section, a home was damaged by a downed tree. A large maple tree was blown down onto Roxborough Avenue between Houghton Street and Ridge Road.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 25-JUL-10 13:35:00 to 25-JUL-10 13:35:00 (EST-5)
Location: WILLOWDALE
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a couple of trees in East Marlborough Township, one fallen tree damaged a home.

Thunderstorm Wind in NORTHAMPTON, PENNSYLVANIA
From 25-JUL-10 13:30:00 to 25-JUL-10 13:30:00 (EST-5)
Location: NORTHAMPTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a fence and tossed a trampoline in Northampton Borough. The combination of damaging winds and lightning caused about 5,000 homes and businesses to lose power in Northampton County, most in Northampton Borough and Lehigh Township.

Hail in CHESTER, PENNSYLVANIA
From 25-JUL-10 13:44:00 to 25-JUL-10 13:44:00 (EST-5)
Location: NEW GARDEN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball size hail fell in New Garden Township.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 25-JUL-10 13:34:00 to 25-JUL-10 13:34:00 (EST-5)
Location: WEST CATASAUQUA
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A severe thunderstorm produced a wind gust of 69 mph at the Lehigh Valley International Airport and knocked down trees within Allentown. The combination of damaging wind and lightning caused about 15,000 homes and businesses to lose power, in the Lehigh Valley, 10,000 of the outages were in Lehigh County.

Thunderstorm Wind in LEHIGH, PENNSYLVANIA
From 25-JUL-10 13:50:00 to 25-JUL-10 13:50:00 (EST-5)
Location: EAST TEXAS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm knocked down a few trees in Lower Macungie Township.

Thunderstorm Wind in CHESTER, PENNSYLVANIA
From 25-JUL-10 13:45:00 to 25-JUL-10 13:45:00 (EST-5)
Location: KENNETT SQUARE
Magnitude: 56.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: County Official

A severe thunderstorm knocked down numerous large trees in Kenneth Square and Kenneth Township. Many homes within Kennett Square sustained water damage after the fallen trees created holes in the roofs. The combination of the damaging winds and lightning across southern Chester County caused power outages that lasted up to twenty-four hours. Of the 45,000 homes and businesses that lost power in the PECO energy service area, Chester County was hardest hit.

Lightning in MONTGOMERY, PENNSYLVANIA
From 25-JUL-10 13:10:00 to 25-JUL-10 13:10:00 (EST-5)
Location: POTTSTOWN
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike and a subsequent fire damaged several trailers in Shaner's Trailer Park on East Main Street in Lower Pottsgrove Township. Lightning was believed to hit either a water or electrical line and then started a fire under one trailer. One woman was injured and hospitalized. Two other trailers were also damaged by the fire. The lightning strike also shorted the phone and cable lines. Two families were displaced.

Thunderstorm Wind in MONTGOMERY, PENNSYLVANIA
From 25-JUL-10 14:39:00 to 25-JUL-10 14:39:00 (EST-5)
Location: PLYMOUTH MEETING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A severe thunderstorm tore down several large tree limbs in Whitpain and Plymouth Townships.