A slow moving weather pattern gave eastern Pennsylvania four days of rainy weather which culminated with periods of heavy rain from the afternoon of the 26th into the morning of the 27th. Four day storm totals averaged 2.5 to 5 inches across most the area with the highest amounts across the Philadelphia northwest suburbs. This caused poor drainage flooding as well as flooding of some of the smaller creeks in and around the local Philadelphia area. Specific storm totals included 5.74 inches in Norristown (Montgomery County), 4.76 inches in Doylestown (Bucks County), 4.11 inches in West Chester (Chester County), 3.73 inches in Chadds Ford  (Delaware County), 3.33 inches in Walnutport (Northampton County), 3.20 inches in Lehighton (Carbon County), 3.00 inches in Mount Pocono (Monroe County), 2.97 inches in Reading (Berks County), 2.93 inches at the Lehigh Valley International Airport and 2.86 inches at the Philadelphia International Airport.
The heavy rain was caused by a long and continuous fetch of tropical moisture between a slow moving upper level low from the south central part of the United States and a blocking ridge over the western Atlantic. The closed system lifted into the Great Lakes on Saturday the 27th and permitted a cold front to move through the region that day and shut off the moisture connection from the tropics.

Flood in PHILADELPHIA, PENNSYLVANIA
From 27-OCT-07 11:15:00 to 27-OCT-07 20:08:00 (EST-5)
Location: MANAYUNK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Wissahickon Creek at its mouth with the Schuylkill River was above its 5 foot flood stage from 1115 a.m. EDT through 908 p.m. EDT on the 8th. It crested at 5.63 feet at 645 p.m. EDT. Storm totals within Philadelphia since precipitation started falling on Wednesday the 24th included 3.06 inches at the Northeast Philadelphia Airport and 2.83 inches at the Philadelphia International Airport.

Flood in MONTGOMERY, PENNSYLVANIA
From 27-OCT-07 08:26:00 to 27-OCT-07 15:48:00 (EST-5)
Location: GRATERFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The heavy rain caused flooding along sections of the East Branch of the Perkiomen Creek and Wissahickon Creek in Montgomery County. The Wissahickon  Creek at Fort Washington was above its 9 foot flood stage from 926 a.m. EDT through 448 p.m. EDT on the 27th. It crested at 10.22 feet at 245 p.m. EDT. The East Branch of the Perkiomen Creek near Schwenksville was above its 7 foot flood stage from 112 p.m. EDT through 415 p.m. EDT on the 27th. It crested at 7.20 feet at 230 p.m. EDT. Some poor drainage flooding also occurred in Norristown. Storm totals within the county since precipitation started falling on Wednesday the 24th included 5.74 inches in Norristown, 4.36 inches in King of Prussia, 3.90 inches in Wynnewood, 3.49 inches in Graterford and 3.40 inches in Palm.

Flood in DELAWARE, PENNSYLVANIA
From 27-OCT-07 07:08:00 to 27-OCT-07 11:48:00 (EST-5)
Location: EDGEMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Crum Creek at Newtown Square was above its 6 foot flood stage from 818 a.m. EDT through 1248 a.m. EDT on the 27th. It crested at 6.71 feet at 930 a.m. EDT. Storm totals within the county since precipitation started falling on Wednesday the 24th included 3.73 inches in Chadds Ford and 3.58 inches in Media.

Flood in BUCKS, PENNSYLVANIA
From 27-OCT-07 14:07:00 to 27-OCT-07 19:53:00 (EST-5)
Location: LANGHORNE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Neshaminy Creek at Langhorne was above its 9 foot flood stage from 307 p.m. EDT through 853 p.m. EDT on the 27th. It crested at 9.49 feet at 6 p.m. EDT. Storm totals within the county since precipitation started falling on Wednesday the 24th included 4.76 inches in Doylestown, 4.09 inches in Furlong, 3.55 inches in Neshaminy Falls and 3.08 inches in Springtown.

Flood in CHESTER, PENNSYLVANIA
From 27-OCT-07 10:59:00 to 27-OCT-07 12:15:00 (EST-5)
Location: VALLEY FORGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Valley Creek at Valley Forge was above its 7 foot flood stage from 1159 a.m. EDT through 115 p.m. EDT on the 27th. It crested at 7.39 feet at 1230 p.m. EDT. Storm totals within the county since precipitation started falling on Wednesday the 24th included 4.11 inches in West Chester, 4.04 inches in Valley Forge, 4.03 inches in London Grove. 3.88 inches in Longwood Gardens and 3.58 inches in East Nantmeal Township.