Heavy rain that fell during the first half of the day on the 25th caused some river and poor drainage flooding in southeastern Pennsylvania.  Event precipitation totals averaged 1.5 to 2 inches, but most of it fell between 6 a.m. and Noon EST. The rain began falling intermittently during the evening of the 24th and became steadier toward morning. The steady rain ended during the early afternoon on the 25th.
The heavy rain was caused by a strong south flow from the Gulf of Mexico. A low pressure system formed over the Gulf Coast states on the morning of the 24th and moved just east of the Appalachians and passed through Maryland and Pennsylvania during the morning of the 25th. The strong south flow and rain ended after its cold front moved through Eastern Pennsylvania during the early afternoon of the 25th.

Flood in CHESTER, PENNSYLVANIA
From 25-JAN-10 14:10:00 to 25-JAN-10 16:36:00 (EST-5)
Location: HARMONY HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The East Branch of the Brandywine Creek below Downingtown was above its 7 foot flood stage from 210 p.m. EST through 434 p.m. EST on the 25th. It crested at 7.18 feet at 315 p.m. EST. Event precipitation totals included 2.44 inches in Kennett Square. 1.88 inches in West Chester, 1.48 inches in Unionville and 1.41 inches in Nottingham.

Flood in DELAWARE, PENNSYLVANIA
From 25-JAN-10 11:56:00 to 25-JAN-10 14:47:00 (EST-5)
Location: BROOKHAVEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Chester Creek at Chester was above its 8 foot flood stage from 1236 p.m. EST through 247 p.m. EST on the 25th. It crested at 8.45 feet at 130 p.m. EST.  The Crum Creek at Newtown Square was above its 6 foot flood stage from 1156 a.m. EST through 247 p.m. EST on the 25th. It crested at 6.5 feet at 1215 p.m. EST. Event precipitation totals included 1.27 inches at the Philadelphia International Airport.

Flood in BUCKS, PENNSYLVANIA
From 25-JAN-10 13:52:00 to 25-JAN-10 22:30:00 (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 152 p.m. EST through 1030 p.m. EST on the 25th. It crested at 10.45 feet at 7 p.m. EST. Event precipitation totals included 1.90 inches in Newtown, 1.83 inches in Langhorne, 1.76 inches in Penndel, 1.61 inches in Bensalem and 1.57 inches in Perkasie.

Flood in MONTGOMERY, PENNSYLVANIA
From 25-JAN-10 09:54:00 to 25-JAN-10 16:37:00 (EST-5)
Location: FT WASHINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 954 a.m. EST through 437 p.m. EST on the 25th. It crested at 10.96 feet at 115 p.m. EST. Event precipitation totals included 2.17 inches in Blue Bell, 2.07 inches in Ardmore, 2.06 inches in North Wales, 1.81 inches in Collegeville, 1.56 inches in Hatfield and 1.48 inches in Souderton.

Flood in PHILADELPHIA, PENNSYLVANIA
From 25-JAN-10 11:47:00 to 25-JAN-10 21:35:00 (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 with the Schuylkill River was above its 5 foot flood stage from 1147 a.m. EST through 935 p.m. EST on the 25th. It crested at 6.44 feet at 530 p.m. EST. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 120 p.m. EST through 622 p.m. EST on the 25th. It crested at 8.34 feet at 430 p.m. EST. Minor flooding also occurred along the Delaware River at high tide. The Delaware River in Philadelphia reached 8.30 feet above mean lower low water at 906 a.m. EST on the 25th. Minor tidal flooding starts at 8.2 feet above mean lower low water. Event precipitation totals included 1.88 inches in Wyndmoor, 1.62 inches in Rockledge and 1.27 inches at the Philadelphia International Airport.