Successive waves of thunderstorms with very heavy rain associated with the remnants of Hurricane Isaac overnight on the 3rd into the evening of the 4th produced pockets of flash flooding in Eastern Pennsylvania.  By far the worst flash flooding occurred in Monroe County where Doppler Radar storm total estimates exceeded 6 inches.

Flash Flood in MONROE, PENNSYLVANIA
From 04-SEP-12 21:55:00 to 05-SEP-12 00:00:00 (EST-5)
Location: STROUDSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms with very heavy downpours caused flash flooding of small creeks as well as poor drainage and low lying area flooding in and around Stroudsburg. A precipitation event total of 5.75 inches was measured in East Stroudsburg.

Flood in PHILADELPHIA, PENNSYLVANIA
From 04-SEP-12 10:38:00 to 04-SEP-12 11:02:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain that fell in Montgomery County earlier in the day caused flooding along the Pennypack Creek.  The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 1138 a.m. EDT through 1202 p.m. EDT on the 4th. It crested at 7.40 feet at 1145 a.m. EDT.

Flood in PHILADELPHIA, PENNSYLVANIA
From 04-SEP-12 17:39:00 to 04-SEP-12 18:13:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

For the third time in the same day, flooding occurred along the Pennypack Creek.    The Pennypack Creek at the Rhawn Street Bridge was again above its 7 foot flood stage from 639 p.m. EDT through 713 p.m. EDT on the 4th. It crested at 7.50 feet at 645 p.m. EDT.

Flash Flood in MONTGOMERY, PENNSYLVANIA
From 04-SEP-12 03:45:00 to 04-SEP-12 04:45:00 (EST-5)
Location: WILLOW GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with very heavy downpours caused flash flooding along the Southampton Creek in Upper Moreland Township.  Flooding from the creek was reported around Byberry and Pioneer Roads.  Storm totals included 2.22 in Williow Grove and 2.12 inches in Jenkintown.

Flash Flood in PHILADELPHIA, PENNSYLVANIA
From 04-SEP-12 13:30:00 to 04-SEP-12 15:00:00 (EST-5)
Location: WEST PHILADELPHIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorms with very heavy downpours caused flash flooding in the Spruce Hill section of Philadelphia, in particular around 43rd and Baltimore Streets. The precipitation total at the Philadelphia International Airport for September 4th was 3.12 inches.

Flash Flood in MONROE, PENNSYLVANIA
From 04-SEP-12 21:00:00 to 05-SEP-12 00:00:00 (EST-5)
Location: BRODHEADSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with very heavy downpours caused flash flooding of small creeks and roadways in sections of Chestnut Hill, Hamilton, Jackson, Middle Smithfield and Stroud Townships. Doppler Radar storm total estimates exceeded 6 inches within the core of the heaviest rain.  Pennsylvania State Route 191 near the former Penn Hills Resort in Stroud Township flooded. Flooding was also reported along sections of the Brodhead Creek that reached onto other roadways.

Flash Flood in PHILADELPHIA, PENNSYLVANIA
From 04-SEP-12 13:03:00 to 04-SEP-12 14:00:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A thunderstorm with heavy rain caused flash flooding along the Pennypack Creek as well as poor drainage flooding in northeastern Philadelphia. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 203 p.m. EDT through 239 p.m. EDT on the 4th. It crested at 7.78 feet at 215 p.m. EDT. Of the three times the Pennypack Creek flooded on the 4th, this was its highest crest of the day.