Periods of rain, heavy at times, produced poor drainage flooding as well as minor to moderate flooding of creeks and rivers in Eastern Pennsylvania from the Lehigh Valley south through the Philadelphia Metropolitan Area. The most widespread creek and river flooding occurred in Chester and Montgomery Counties. Event precipitation totals averaged two to three inches, with some locally higher amounts in the Lehigh Valley.  The steady rain began during the morning of the 22nd, fell at its heaviest from the evening of the 22nd into the early morning of the 23rd. The rain ended during the morning of the 23rd.
The rain was caused by a low pressure system that moved from the lower Ohio Valley on the morning of the 22nd northeast into western Pennsylvania on the evening of the 22nd. The low then moved east and passed across Eastern Pennsylvania during the mid morning of the 23rd and moved off the New Jersey coast during the early afternoon of the 23rd on its way to Cape Cod, Massachusetts.

Flood in MONTGOMERY, PENNSYLVANIA
From 22-NOV-11 22:26:00 to 23-NOV-11 19:45:00 (EST-5)
Location: EAST GREENVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

In Perkiomen Township, Plank Road was flooded and closed over the main stem of the Perkiomen Creek.
The Schuylkill River at Norristown was above its 13 foot flood stage from 524 a.m. EST through 745 p.m. EST on the 23rd.  It crested at 14.15 feet at 1115 a.m. EST.  The East Branch of the Perkiomen Creek at Schwenksville had moderate flooding and was above its 7 foot flood stage from 1237 a.m. EST through 1227 p.m. EST on the 23rd.  It crested at 8.32 feet at 615 a.m. EST. The main stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 1026 p.m. EST on the 22nd through 951 a.m. EST on the 23rd.  It crested at 4.86 feet at 715 a.m. EST on the 23rd . Farther downstream, the main stem of the Perkiomen Creek at Graterford  was above its 11 foot flood stage from 410 a.m. EST through 102 p.m. EST on the 23rd.  It crested at 12.61 feet at 715 a.m. EST.

Event precipitation totals included 3.00 inches in Pottstown, 2.95 inches in Collegeville, 2.89 inches in Harleysville, 2.78 inches in Hatfield, 2.34 inches in West Norriton and 2.21 inches in Willow Grove.

Flood in DELAWARE, PENNSYLVANIA
From 23-NOV-11 08:15:00 to 23-NOV-11 22:24:00 (EST-5)
Location: CHADDS FORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The main stem of the Brandywine Creek was above its 9 foot flood stage from 815 a.m. EST on the 23rd through 1024 p.m. EST on the 23rd.  It crested at 10.13 feet at 445 p.m. EST. Event precipitation totals included 2.43 inches at the Philadelphia International Airport.

Flood in PHILADELPHIA, PENNSYLVANIA
From 23-NOV-11 04:35:00 to 23-NOV-11 06:03:00 (EST-5)
Location: MANAYUNK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Wissahickon Creek at its mouth was above its 5 foot flood stage from 435 a.m. EST through 603 a.m. EST on the 23rd.  It crested at 5.07 feet at 445 a.m. EST.  Event precipitation totals included 2.43 inches at the Philadelphia International Airport.

Flood in BUCKS, PENNSYLVANIA
From 23-NOV-11 02:55:00 to 23-NOV-11 09:00:00 (EST-5)
Location: LANGHORNE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 255 a.m. EST through 9 a.m. EST on the 23rd.  It crested at 9.49 feet at 615 a.m. EST. Event precipitation totals included 3.05 inches in Pennsburg, 2.50 inches in Newtown and 2.49 inches in Penndel.

Flood in BERKS, PENNSYLVANIA
From 23-NOV-11 01:11:00 to 23-NOV-11 12:24:00 (EST-5)
Location: MANATAWNY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Manatawny Creek at Spangsville was above its 6 foot flood stage from 111 a.m. EST through 1224 p.m. EST on the 23rd.  It crested at 6.59 feet at 900 a.m. EST. Event precipitation totals were 2.88 inches in Fleetwood, 2.79 inches in Kutztown, 2.75 inches in Mohnton, 2.72 inches in Wyomissing, 2.68 inches in Reading and 2.63 inches in Oley.

Flood in NORTHAMPTON, PENNSYLVANIA
From 23-NOV-11 04:55:00 to 23-NOV-11 13:15:00 (EST-5)
Location: BETHLEHEM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Monocacy Creek at Bethlehem was above its 4.5 foot flood stage from 455 a.m. EST on the 23rd through 730 a.m. EST on the 23rd and again from 1209 p.m. EST through 115 p.m. EST on the 23rd.  Its highest crest was 4.58 feet at 515 a.m. EST on the 23rd.  Event precipitation totals included 3.33 inches in Nazareth, 3.11 inches in Bethlehem,  3.04 inches in Martins Creek and 2.89 inches at the Lehigh Valley International Airport and Glendon.

Flood in CHESTER, PENNSYLVANIA
From 23-NOV-11 03:43:00 to 23-NOV-11 22:24:00 (EST-5)
Location: HONEY BROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The West Branch of the Brandywine Creek at Honey Brook was above its 7 foot flood stage from 557 a.m. EST through 943 a.m. EST on the 23rd.  It crested at 7.38 feet at 745 a.m. EST. The East Branch of the Brandywine Creek below Downingtown had moderate flooding and was above its 7 foot flood stage from 620 a.m. EST through 1202 p.m. EST on the 23rd.  It crested at 9.51 feet at 845 a.m. EST. The main stem of the Brandywine Creek was above its 9 foot flood stage from 815 a.m. EST on the 23rd through 1024 p.m. EST on the 23rd.  It crested at 10.13 feet at 445 p.m. EST. The French Creek at Phoenixville was above its 8 foot flood stage from 343 a.m. EST through 215 p.m. EST on the 23rd.  It crested at 8.78 feet at 515 a.m. EST.
Event precipitation totals included 2.97 inches in Unionville and 2.81 inches in Nottingham.