A slow moving cold front and a moist unstable airmass combined to produce scattered severe thunderstorms and flash flooding across eastern Ohio and Western Pennsylvania. Flash flooding was deadly in Pittsburgh when approximately 2.5 inches of rain fell in a very urbanized area just east of downtown Pittsburgh on Washington Blvd in just under an hour. This resulted in four fatalities and up to 15 water rescues.

Hail in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:26:00 to 19-AUG-11 14:26:00 (EST-5)
Location: WALL ROSE
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Hail in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:50:00 to 19-AUG-11 14:50:00 (EST-5)
Location: AMBRIDGE
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Hail in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:53:00 to 19-AUG-11 14:53:00 (EST-5)
Location: ALIQUIPPA ARPT
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 14:10:00 to 19-AUG-11 14:10:00 (EST-5)
Location: MERCER
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 09:45:00 to 19-AUG-11 09:45:00 (EST-5)
Location: ELIZABETH
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

The public reported large branches broken off trees.

Thunderstorm Wind in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:30:00 to 19-AUG-11 14:30:00 (EST-5)
Location: ECONOMY
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported power lines down.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 15:01:00 to 19-AUG-11 15:01:00 (EST-5)
Location: LEETSDALE
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported trees down.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 19-AUG-11 15:22:00 to 19-AUG-11 15:22:00 (EST-5)
Location: NEW KENSINGTON
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported power lines down.

Hail in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 16:05:00 to 19-AUG-11 16:05:00 (EST-5)
Location: DONORA
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 19-AUG-11 16:34:00 to 19-AUG-11 16:34:00 (EST-5)
Location: MONESSEN
Magnitude: 50.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

The public reported shingles blown off and large tree branches down on homes.

Thunderstorm Wind in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 15:59:00 to 19-AUG-11 15:59:00 (EST-5)
Location: ELIZABETH
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

The public reported large branches down.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 16:04:00 to 19-AUG-11 16:04:00 (EST-5)
Location: MONONGAHELA
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

The public reported large branches down.

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 15:45:00 to 19-AUG-11 18:00:00 (EST-5)
Location: OPTION
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported flash flooding on Bigelow BLVD at Frank Curto Park closing the road.

Flash Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 16:36:00 to 19-AUG-11 19:00:00 (EST-5)
Location: DAVIDSON HGTS
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported flash flooding with 2 to 3 feet of water flowing across Sohn Road with debris.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 19-AUG-11 16:00:00 to 19-AUG-11 16:00:00 (EST-5)
Location: FELLSBURG
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down.

Thunderstorm Wind in WESTMORELAND, PENNSYLVANIA
From 19-AUG-11 16:10:00 to 19-AUG-11 16:10:00 (EST-5)
Location: WYANO
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down.

Hail in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 15:11:00 to 19-AUG-11 15:11:00 (EST-5)
Location: CHERRY CITY
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:40:00 to 19-AUG-11 15:40:00 (EST-5)
Location: BOWER HILL
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:40:00 to 19-AUG-11 15:40:00 (EST-5)
Location: VENETIA
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down on Bebout Rd.

Flash Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 17:43:00 to 19-AUG-11 19:00:00 (EST-5)
Location: BRIDGEWATER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported flash flooding in Beaver with debris flow in streets and water in a few buildings.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:38:00 to 19-AUG-11 19:00:00 (EST-5)
Location: CONWAY
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported 13th ST was flooded with standing water.

Flood in MERCER, PENNSYLVANIA
From 19-AUG-11 14:45:00 to 19-AUG-11 17:00:00 (EST-5)
Location: MILBURN
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported standing water flooding SR 158 between New Wilmington and Mercer.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 15:05:00 to 19-AUG-11 19:00:00 (EST-5)
Location: WEST ALIQUIPPA
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported flooding with standing water on State Street and Duss Ave.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:48:00 to 19-AUG-11 15:48:00 (EST-5)
Location: FINLEYVILLE
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down on Elrama Rd.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 15:05:00 to 19-AUG-11 19:00:00 (EST-5)
Location: SHAFERS
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported standing water and flooding on Sassafra Lane.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:48:00 to 19-AUG-11 15:48:00 (EST-5)
Location: MONONGAHELA
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported large trees down on Hillman Steet and James Street.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:57:00 to 19-AUG-11 15:57:00 (EST-5)
Location: DONORA
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported power lines down on Watkins Avenue.

Thunderstorm Wind in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:50:00 to 19-AUG-11 15:50:00 (EST-5)
Location: FINLEYVILLE
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a telephone pole down on Coal Bluff Road.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 15:09:00 to 19-AUG-11 19:00:00 (EST-5)
Location: AMBRIDGE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported standing water and flooding of Ohio River BLVD.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 15:39:00 to 19-AUG-11 19:00:00 (EST-5)
Location: BEAVER FALLS
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported flooding and a mudslide on Constitution BLVD.

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 15:15:00 to 19-AUG-11 19:00:00 (EST-5)
Location: WEST ALIQUIPPA
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported standing water and flooding on Tevebaugh Rd in Baden.

Flood in WASHINGTON, PENNSYLVANIA
From 19-AUG-11 15:55:00 to 19-AUG-11 19:00:00 (EST-5)
Location: GASTONVILLE
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported Elrama RD flooded.

Hail in LAWRENCE, PENNSYLVANIA
From 19-AUG-11 06:42:00 to 19-AUG-11 06:42:00 (EST-5)
Location: NEW CASTLE
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Hail in CLARION, PENNSYLVANIA
From 19-AUG-11 08:44:00 to 19-AUG-11 08:44:00 (EST-5)
Location: CLARION PARKER ARPT
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, PENNSYLVANIA
From 19-AUG-11 09:34:00 to 19-AUG-11 09:34:00 (EST-5)
Location: CORSICA
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:16:00 to 19-AUG-11 12:16:00 (EST-5)
Location: MERCER
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:32:00 to 19-AUG-11 12:32:00 (EST-5)
Location: HENLEIN
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:34:00 to 19-AUG-11 12:34:00 (EST-5)
Location: GROVE CITY
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in VENANGO, PENNSYLVANIA
From 19-AUG-11 12:48:00 to 19-AUG-11 12:48:00 (EST-5)
Location: BARKEYVILLE
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:49:00 to 19-AUG-11 12:49:00 (EST-5)
Location: GROVE CITY
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Hail in LAWRENCE, PENNSYLVANIA
From 19-AUG-11 06:36:00 to 19-AUG-11 06:36:00 (EST-5)
Location: MT JACKSON
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Hail in CLARION, PENNSYLVANIA
From 19-AUG-11 08:41:00 to 19-AUG-11 08:41:00 (EST-5)
Location: MIOLA
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Hail in JEFFERSON, PENNSYLVANIA
From 19-AUG-11 09:16:00 to 19-AUG-11 09:16:00 (EST-5)
Location: ROSEVILLE
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:12:00 to 19-AUG-11 12:12:00 (EST-5)
Location: MERCER
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:27:00 to 19-AUG-11 12:27:00 (EST-5)
Location: GROVE CITY
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:38:00 to 19-AUG-11 12:38:00 (EST-5)
Location: GROVE CITY
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in BEAVER, PENNSYLVANIA
From 19-AUG-11 14:25:00 to 19-AUG-11 14:25:00 (EST-5)
Location: COLONA
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LAWRENCE, PENNSYLVANIA
From 19-AUG-11 14:31:00 to 19-AUG-11 14:31:00 (EST-5)
Location: NEW BEDFORD
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Trained Spotter

Flood in BEAVER, PENNSYLVANIA
From 19-AUG-11 16:17:00 to 19-AUG-11 19:00:00 (EST-5)
Location: DAVIDSON HGTS
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Newspaper

A newspaper reported flooding with mud and debris into businesses on Franklin Ave.

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:54:00 to 19-AUG-11 12:54:00 (EST-5)
Location: GROVE CITY
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 12:58:00 to 19-AUG-11 12:58:00 (EST-5)
Location: GROVE CITY
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, PENNSYLVANIA
From 19-AUG-11 13:57:00 to 19-AUG-11 13:57:00 (EST-5)
Location: WEST MIDDLESEX
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Flash Flood in ALLEGHENY, PENNSYLVANIA
From 19-AUG-11 15:36:00 to 19-AUG-11 18:00:00 (EST-5)
Location: SHARPSBURG
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A NWS storm survey found that 2.5 inches of rain fell in one hour in a very urbanized 4.8 sq mi watershed just east of downtown Pittsburgh. Severe flash flooding developed on Washington Blvd resulting in four fatalities and up to 15 water rescues.  A mother and two daughters were drowned inside a van when it became submerged in approximately 9 ��� 10 feet of water.  An elderly lady who abandoned her car was apparently swept or fell into an open manhole or catch basin and drowned.