A protracted rain event from the early morning on the 6th through the early morning on the 8th culminated with heavy rain during the afternoon and evening of the 7th and caused poor drainage flooding in Eastern Pennsylvania. The rain changed to snow before ending in parts of Berks County and the Lehigh Valley as well as all of the Poconos, but most of the accumulations were confined to the higher terrain in the Poconos. The heavy rain also caused minor to locally moderate river and creek flooding in Berks County and Southeast Pennsylvania. Event precipitation totals averaged around two inches. The rain was caused by waves of low pressure that moved northeast along a slowly moving frontal boundary. The cold front was in central Pennsylvania on the morning of the 6th and eastern Pennsylvania on the morning of the 7th. The last wave of low pressure on this boundary, located over western North Carolina at 7 a.m. EST on the 7th intensified rapidly as the 7th progress. It was during this intensification process that rain fell at its heaviest that afternoon and evening. The low pressure system itself passed through Delaware during the early evening of the 7th and was over the Monmouth County, New Jersey coastal waters at 10 p.m. EST on the 7th. It reached Long Island, New York at 1 a.m. EST on the 8th. As the low reached Long Island, the rain ended across Berks County and southeastern Pennsylvania.

Flood in BUCKS, PENNSYLVANIA
From 07-DEC-11 23:34:00 to 08-DEC-11 09:46:00 (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 had moderate flooding and was above its 9 foot flood stage from 1134 p.m. EST on the 7th through 946 a.m. EST on the 8th. It crested at 10.61 feet at 330 a.m. EST on the 8th. Event precipitation totals included 2.61 inches in Penndel, 2.57 inches in Langhorne and Newtown, 2.42 inches in Doylestown and 2.15 inches in Pennsburg.

Flood in BERKS, PENNSYLVANIA
From 08-DEC-11 00:33:00 to 08-DEC-11 06:12:00 (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 1233 a.m. EST through 612 a.m. EST on the 8th. It crested at 6.41 feet at 345 a.m. EST on the 8th. Event precipitation totals included 2.03 inches in Oley, 2.01 inches in Kutztown, 1.96 inches in Fleetwood, 1.80 inches in Oley and 1.66 inches in Reading.

Flood in MONTGOMERY, PENNSYLVANIA
From 07-DEC-11 21:42:00 to 08-DEC-11 10:37:00 (EST-5)
Location: FRUITVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Schuylkill River at Norristown was above its 13 foot flood stage from 136 a.m. EST through 1037 a.m. EST on the 8th. It crested at 13.55 feet at 445 a.m. EST on the 8th. The East Branch of the Perkiomen Creek at Schwenksville was above its 7 foot flood stage from 1045 p.m. EST on the 7th through 615 a.m. EST on the 8th. It crested at 7.92 feet at 200 a.m. EST on the 8th. The main stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 1042 p.m. EST on the 7th through 427 a.m. EST on the 8th. It crested at 4.69 feet at 230 a.m. EST on the 8th. The Wissahickon Creek at Fort Washington had moderate flooding and was above its 9 foot flood stage from 942 p.m. EST on the 7th through 331 a.m. EST on the 8th. It crested at 10.47 feet at 100 a.m. EST on the 8th.
Event precipitation totals included 2.64 inches in Lansdale, 2.60 inches in Ardmore, 2.45 inches in Plymouth Meeting, 2.40 inches in Blue Bell, 2.38 inches in Fort Washington, 2.27 inches in Hatfield, 2.26 inches in Harleysville, 2.00 inches in Schwenksville and 1.90 inches in Pottstown.

Flood in CHESTER, PENNSYLVANIA
From 07-DEC-11 21:12:00 to 08-DEC-11 14:16:00 (EST-5)
Location: HONEY BROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Minor flooding was reported in the Brandywine Basin. Minor flooding also occurred along the French and Valley Creeks. The West Branch of the Brandywine Creek at Honey Brook was above its 7 foot flood stage from 1048 p.m. EST on the 7th through 345 a.m. EST on the 8th. It crested at 7.67 feet at 115 a.m. EST on the 8th. The East Branch of the Brandywine Creek below Downingtown was above its 7 foot flood stage from 1147 p.m. EST on the 7th through 621 a.m. EST on the 8th. It crested at 8.94 feet at 145 a.m. EST on the 8th. Farther downstream, the main stem of the Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 307 a.m. EST through 216 p.m. EST on the 8th. It crested at 9.95 feet at 915 a.m. EST. The French Creek at Phoenixville was above its 8 foot flood stage from 1054 p.m. EST on the 7th 215 a.m. EST on the 8th. It crested at 8.20 feet at 1215 a.m. EST on the 8th. The Valley Creek at Valley Forge was above its 7 foot flood stage from 912 p.m. EST on the 7th through 138 a.m. EST on the 8th. It crested at 7.51 feet at 1145 p.m. EST on the 7th.
Event precipitation totals included 2.65 inches in Spring City, 2.35 inches in Unionville, 2.34 inches in Nottingham and 2.30 inches in West Chester.

Flood in DELAWARE, PENNSYLVANIA
From 07-DEC-11 21:53:00 to 08-DEC-11 14:16:00 (EST-5)
Location: CHADDS FORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 307 a.m. EST through 216 p.m. EST on the 8th. It crested at 9.95 feet at 915 a.m. EST.  The Crum Creek at Newtown Square was above its 6 foot flood stage from 953 p.m. EST on the 7th through 143 a.m. EST on the 8th. It crested at 6.53 feet at 1130 p.m. EST on the 7th. The Chester Creek at Chester was above its 8 foot flood stage from 1145 p.m. EST on the 7th through 1235 a.m. EST on the 8th. It crested at 8.08 feet at 1230 a.m. EST on the 8th. Event precipitation totals included 2.26 inches at the Philadelphia International Airport.