A slow moving cold front helped trigger showers and thunderstorms with heavy rain that fell during the late afternoon and early evening on the 24th.  Event precipitation totals averaged 1.5 to 3.0 inches across southeastern Pennsylvania with the heaviest rain across the fall line region from eastern Chester County northeast across southern or lower Montgomery and Bucks Counties. This caused flash flooding during the early evening and runoff flooding through the night of the 24th.

Flood in PHILADELPHIA, PENNSYLVANIA
From 24-OCT-09 22:51:00 to 25-OCT-09 03:49:00 (EST-5)
Location: GERMANTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain earlier in the evening in both Philadelphia and Montgomery Counties caused flooding along the Wissahickon Creek. The Wissahickon Creek at its mouth with the Schuylkill River was above its 5 foot flood stage from 1151 p.m. EDT on the 24th through 449 a.m. EDT on the 25th. It crested at 5.75 feet at 245 a.m. EDT on the 25th.  Event precipitation totals included 1.61 inches at the Northeast Philadelphia Airport, 1.52 inches at the Philadelphia International Airport and 1.50 inches within Philadelphia.

Flash Flood in MONTGOMERY, PENNSYLVANIA
From 24-OCT-09 17:15:00 to 24-OCT-09 19:15:00 (EST-5)
Location: PENCOYD STATION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy rain caused flash flooding along the Schuylkill Expressway and other low lying roadways in Lower Merion Township.

Flood in MONTGOMERY, PENNSYLVANIA
From 24-OCT-09 19:59:00 to 25-OCT-09 02:36:00 (EST-5)
Location: LEDERACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavier rain earlier on the evening of the 24th caused flooding along sections of the East Branch of the Perkiomen Creek. The East Branch of the Perkiomen Creek near Schwenksville was above its 7 foot flood stage from 859 p.m. EDT on the 24th through 336 a.m. EDT on the 25th. It crested at 8.94 feet at Midnight EDT on the 25th. Event precipitation totals in Montgomery County included 2.68 inches in Willow Grove, 2.57 inches in Hatfield, 2.16 inches in Souderton and 2.14 inches in Graterford.

Flood in PHILADELPHIA, PENNSYLVANIA
From 24-OCT-09 22:25:00 to 25-OCT-09 01:10:00 (EST-5)
Location: TACONY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain earlier in the evening in both Philadelphia and Montgomery Counties caused flooding along the Pennypack Creek. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 1125 p.m. EDT on the 24th through 210 a.m. EDT on the 25th. It crested at 7.39 feet at 115 a.m. EDT on the 25th.  Event precipitation totals included 1.61 inches at the Northeast Philadelphia Airport, 1.52 inches at the Philadelphia International Airport and 1.50 inches within Philadelphia.

Flash Flood in BUCKS, PENNSYLVANIA
From 24-OCT-09 19:00:00 to 24-OCT-09 21:00:00 (EST-5)
Location: TREVOSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Showers and thunderstorms with heavy rain caused flash flooding of some of the smaller creeks as well as poor drainage flooding mainly in the central third of Bucks County during the evening of the 24th. The runoff from the heavy rain that evening caused the Neshaminy Creek to just reach its 9 foot flood stage early on the 25th. The East Branch of the Perkiomen Creek flooded in Perkasie and caused some road closures. Event precipitation totals included 2.70 inches in Perkasie, 2.54 inches in Doylestown, 2.17 inches in Newtown, 1.87 inches in Southampton, 1.71 inches in Penndel  and 1.50 inches in Springtown.

Flood in MONTGOMERY, PENNSYLVANIA
From 24-OCT-09 19:11:00 to 24-OCT-09 23:35:00 (EST-5)
Location: FLOURTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavier rain earlier on the evening of the 24th caused flooding along sections of the Wissahickon Creek. The Wissahickon Creek at Fort Washington was above its 9 foot flood stage from 811 p.m. EDT on the 24th through 1235 a.m. EDT on the 25th. It crested at 10.84 feet at 1030 p.m. EDT on the 24th. Event precipitation totals in Montgomery County included 2.68 inches in Willow Grove, 2.57 inches in Hatfield, 2.16 inches in Souderton and 2.14 inches in Graterford.

Flood in BUCKS, PENNSYLVANIA
From 25-OCT-09 00:15:00 to 25-OCT-09 00:15:00 (EST-5)
Location: LANGHORNE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain on the evening of the 24th caused the Neshaminy Creek to just reach its 9 foot flood stage at 115 a.m. EDT on the 25th.  Event precipitation totals included 2.70 inches in Perkasie, 2.54 inches in Doylestown, 2.17 inches in Newtown, 1.87 inches in Southampton, 1.71 inches in Penndel  and 1.50 inches in Springtown.

Flash Flood in CHESTER, PENNSYLVANIA
From 24-OCT-09 17:30:00 to 24-OCT-09 19:30:00 (EST-5)
Location: PLANEBROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy rain caused small stream flooding as well as poor drainage flooding along Pennsylvania State Route 29 and U.S. Route 30 in Tredyffrin and East Whiteland Townships. Event precipitation totals included 2.34 inches in Valley Forge, 2.19 inches in Downingtown and 2.09 inches in Longwood Gardens.

Flash Flood in PHILADELPHIA, PENNSYLVANIA
From 24-OCT-09 18:25:00 to 24-OCT-09 20:30:00 (EST-5)
Location: CRESCENTVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Showers and thunderstorms with heavy rain caused flash flooding along the Frankford Creek and also poor drainage flooding within Philadelphia. The Frankford Creek at Castor Avenue was above its 7 foot flood stage from 725 p.m. EDT through 739 p.m. EDT on the 24th. it crested at 7.57 feet at 730 p.m. EDT. Event precipitation totals included 1.61 inches at the Northeast Philadelphia Airport, 1.52 inches at the Philadelphia International Airport and 1.50 inches within Philadelphia.

Flood in DELAWARE, PENNSYLVANIA
From 24-OCT-09 19:35:00 to 24-OCT-09 23:17:00 (EST-5)
Location: FLORIDA PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain earlier in the evening caused flooding along sections of Crum Creek. The Crum Creek at Newtown Square was above its 6 foot flood stage from 835 p.m. EDT through 1217 a.m. EDT on the 25th. It crested at 7.87 feet at 11 p.m. EDT on the 24th.  Event precipitation totals included 1.52 inches at the Philadelphia International Airport.