Four days of rain, heaviest on the 13th, culminated in flooding across southeastern Pennsylvania. Event precipitation totals ranged from around 2 inches in the Poconos to 3 to 5 inches in the local Philadelphia area. Periods of rain started during the morning of the 12th and on the 13th fell at the heaviest during the daylight hours. Periods of lighter rain persisted into the 14th and 15th. The area avoided the heaviest rain that fell with the system over New Jersey.
The heavy rain was caused by a slow moving low pressure system that had a tremendous fetch of moist air from the Atlantic Ocean. The low pressure system moved from the South Carolina coast on the morning of the 12th, into Virginia on the morning of the 13th, to Delaware on the morning of the 14th and then drifted slowly east over the next two days as it was captured by an upper level system.
The flooding occurred on the weekend when eastern daylight time began. Some of the river flooding started on Eastern Standard Time and ended on Eastern Daylight Time, we apologize for any confusion this causes.

Heavy Rain in NORTHAMPTON, PENNSYLVANIA
From 13-MAR-10 12:00:00 to 13-MAR-10 18:00:00 (EST-5)
Location: BETHLEHEM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Event precipitation totals included 3.11 inches in Bath, 2.54 inches in in Easton and 2.22 inches in Northampton.

Flood in MONTGOMERY, PENNSYLVANIA
From 13-MAR-10 13:03:00 to 14-MAR-10 03:01:00 (EST-5)
Location: FT WASHINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The East Branch of the Perkiomen Creek at Schwenksville was above its 7 foot flood stage from 344 p.m. EST on the 13th through 401 a.m. EDT on the 14th. It crested at 8.87 feet at 11 p.m. EST on the 13th. The Main Stem of the Perkiomen Creek at East Greenville was above its 4 foot flood stage from 700  p.m. EST through 900 pm. EST on the 13th. It crested at 4.07 feet at 8 p.m. EST. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 103 p.m. EST through 1037 p.m. EST on the 13th. It crested at 11.43 feet at 645 p.m. EST. Event precipitation totals included 4.21 inches in Ardmore, 3.13 inches in Willow Grove, 2.62 inches in Pottstown and 2.55 inches in Green Lane.

Flood in PHILADELPHIA, PENNSYLVANIA
From 13-MAR-10 14:29:00 to 13-MAR-10 23:56:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 229 p.m. EST through 1156 p.m. EST on the 13th. It crested at 8.64 feet at 10 p.m. EST. In addition to the poor drainage and creek flooding, the combination of the fresh water runoff and the onshore flow caused minor tidal flooding along the Delaware River and its tributaries from the afternoon high tide on the 13th through the early morning high tide on the 15th. The highest tides occurred on the afternoon of the 14th. The high tide in Philadelphia reached 9.09 feet above mean lower low water. This was barely below the level at which moderate tidal flooding begins (9.2 feet above mean lower low water). Event precipitation totals included 3.95 inches in Fox Chase, 3.76 inches at the Philadelphia International Airport and 3.45 inches at the Franklin Institute.

Flood in BERKS, PENNSYLVANIA
From 13-MAR-10 21:15:00 to 13-MAR-10 23:37:00 (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 Spangville was above its 6 foot flood stage from 915 p.m. EST through 1137 p.m. EST on the 13th. It crested at 6.1 feet at 1030 p.m. EST. Event precipitation totals included 2.67 inches in Morgantown, 2.52 in West Lawn and 1.44 inches in Reading.

Flood in CHESTER, PENNSYLVANIA
From 13-MAR-10 15:21:00 to 14-MAR-10 10:05:00 (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 617 p.m. EST through 1046 p.m. EST on the 13th. It crested at 7.57 feet at 815 p.m. EDT on the 13th. The East Branch of the Brandywine Creek at Dowingtown was above its 7 foot flood stage from 419 p.m. EST on the 13th through 1235 a.m. EST on the 14th. It crested at 9.64 feet at 845 p.m. EST on the 13th. The main stem of the Brandywine Creek at Chadds Ford was above its 9 foot flood stage from 920 p.m. EST on the 13th through 1105 a.m. EDT on the 14th. It crested at 530 a.m. EDT on the 14th. The French Creek at Phoenixville was above its 8 foot flood stage from 340 p.m. EST on the 13th through 752 a.m. EDT on the 14th. It crested at 9.35 feet at 645 p.m. EST on the 13th.  The Valley Creek at Valley Forge was above its 7 foot flood stage from 321 p.m. EST through 913 p.m. EST on the 13th. It crested at 8.18 feet at 6 p.m. EST. Event precipitation totals were 3.47 inches in West Chester, 3.36 inches in Unionville. 3.14 inches in Honey Brook and 2.50 inches in Kenneth Square.

Flood in DELAWARE, PENNSYLVANIA
From 13-MAR-10 15:31:00 to 14-MAR-10 10:05:00 (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 920 p.m. EST on the 13th through 1105 a.m. EDT on the 14th. It crested at 530 a.m. EDT on the 14th. The Chester Creek at Chester was above its 8 foot flood stage from 403 p.m. EST through 913 p.m. EST on the 13th. It crested at 9.54 feet at 615 p.m. EDT. The Crum Creek at Newtown Square was above its 6 foot flood stage from 331 p.m. EST through 947 p.m. EST on the 13th. It crested at 7.77 feet at 615 p.m. EST. Event precipitation totals included 3.76 inches at the Philadelphia International Airport.

Heavy Rain in LEHIGH, PENNSYLVANIA
From 13-MAR-10 12:00:00 to 13-MAR-10 18:00:00 (EST-5)
Location: ALLENTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Event precipitation totals included 2.52 inches in Emmaus and 2.35 inches at the Lehigh Valley international Airport.

Flood in BUCKS, PENNSYLVANIA
From 13-MAR-10 15:30:00 to 14-MAR-10 09:08:00 (EST-5)
Location: LANGHORNE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Flooding on the Neshaminy Creek flooded Bridal Drive, but no homes were affected. Roadway flooding was reported from County Line to River Road in the county. Pennsylvania State Route 32 was closed due to flooding in Yardley and Solebury. The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 330 p.m. EST on the 13th through 1008 a.m. EDT on the 14th. It crested at 12.85 feet at 1 a.m. EST on the 14th. The East Branch of the Perkiomen Creek at Dublin was above its 5 foot flood stage from 426 p.m. EST through 658 pm. EST on the 13th. It crested at 5.28 feet at 515 p.m. EST. Event precipitation totals included 4.84 inches in Sellersville, 4.60 inches in Doylestown and 3.54 inches in Perkasie.