A warm front that moved northeast in the morning and a cold front that arrived from the west late in the day on the 2nd resulted in numerous showers and thunderstorms across the area with heavy rain and flash flooding. The region was already saturated from all of the heavy rain that fell during the last week of July. Doppler Radar storm total estimates reached as high as 4 to 5 inches across eastern Chester, southern Montgomery and southwestern Bucks Counties and caused flash flooding. Doppler Radar storm total estimates also exceeded 3 inches in parts of western and southern Berks County. Because of the flooding, Pennsylvania Governor Ed Rendell requested and received approval from the United States Small Business Administration to have disaster area declaration for Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and Philadelphia Counties.

Flash Flood in CHESTER, PENNSYLVANIA
From 02-AUG-09 09:35:00 to 02-AUG-09 13:30:00 (EST-5)
Location: GLEN ROY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with torrential downpours caused flooding of streams in the Octoraro Creek basin in southwestern Chester County. Roadway flooding occurred in Oxford and flooding was reported in Pine Grove (Lower Oxford Township) south of the Octoraro Lake. Doppler Radar storm total estimates reached around 3 inches in the southwest part of Chester County.

Flash Flood in BUCKS, PENNSYLVANIA
From 02-AUG-09 10:15:00 to 02-AUG-09 14:15:00 (EST-5)
Location: KEELERSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Thunderstorms with torrential downpours caused flash flooding of smaller streams and roadway flooding in upper Bucks County. Several roadways were closed. Doppler Radar storm total estimates averaged 2 to 3 inches. In Springfield Township, Cooks Creek flooded and Durham Road was closed. Other roadways flooded and closed included U.S. Route 309 in Richland and Pennsylvania State Route 313 in Quakertown. Roads were closed in East Rockhill Township. The East Branch of the Perkiomen Creek was flooding in Perkasie. A couple of roadways suffererd poor drainage flooding along the Delaware River in Solebury, Plumstead and Tinicum Townships. The East Branch of the Perkiomen Creek at Dublin was above its 5 foot flood stage from 1235 p.m. EDT through 120 p.m. EDT on the 2nd. It crested at 5.16 feet at 1245 p.m. EDT. Storm rainfall totals included 3.68 inches in Pennsburg, 3.66 inches in Doylestown, 2.70 inches in Springtown and 1.85 inches in Perkasie.

Flash Flood in BUCKS, PENNSYLVANIA
From 02-AUG-09 10:30:00 to 02-AUG-09 16:02:00 (EST-5)
Location: NEWTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Thunderstorms with torrential downpours caused poor drainage flooding as well as flooding along the Neshaminy Creek basin in lower or southern Bucks County.  Doppler Radar storm total estimates reached three to four inches in the area. The Neshaminy Creek covered roads and backyards near Langhorne. Four people were canoeing along the rising creek and were thrown into it along the Northampton and Wrightstown border. They were rescued. Numerous roads were flooded in Newtown and Warrington Townships. The Little Neshaminy Creek near Neshaminy was above its 8 foot flood stage from 1130 a.m. EDT through 502 p.m. EDT on the 2nd. It crested at 9.05 feet at Noon EDT. Storm totals included 3.53 inches in Southampton, 3.46 inches in Furlong and 2.46 inches in Langhorne.

Flash Flood in DELAWARE, PENNSYLVANIA
From 02-AUG-09 10:20:00 to 02-AUG-09 16:20:00 (EST-5)
Location: HAVERFORD
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused flash flooding along Cobbs Creek and other small streams particularly in the eastern half of Delaware County. Many water rescues from trapped vehicles occurred. Hardest hit was Haverford Township. Doppler Radar storm total estimates reached between 3 and 4 inches in the northeast part of the county.
In Haverford Township, an emergency disaster was declared. Homes bordering Cobbs Creek and its tributaries were damaged. On Eagle Road, cars were submerged and homes were surrounded by water. Roads and bridges on Hathaway Lane were damaged. Homes and vehicles on Wynnefield Drive were flooded. Six roads in the township were flooded. In Darby Borough, flood waters from the Darby Creek washed away a portion of McDade Boulevard. Ten residents were evacuated from Springfield Road. Roadway and basement flooding also occurred in Lansdowne Borough and Chester City. The precipitation event total at the Philadelphia International Airport was 1.59 inches.

Flash Flood in MONTGOMERY, PENNSYLVANIA
From 02-AUG-09 10:42:00 to 02-AUG-09 15:14:00 (EST-5)
Location: FRUITVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Thunderstorms with torrential downpours caused flash flooding in the headwaters of the Perkiomen River Basin in northern Montgomery County. Doppler Radar storm total estimates averaged around three inches in the area. The West Branch of the Perkiomen Creek at Hillegass was above its 5 foot flood stage from 1213 p.m. EDT through 110 p.m. EDT on the 2nd. It crested at 5.11 feet at 1245 p.m. EDT. The Perkiomen Creek at East Greenville was above its 4 foot flood stage from 1142 a.m. EDT through 414 p.m. EDT on the 2nd. It crested at 4.91 feet at 315 p.m. EDT. In Palm, the actual storm precipitation total was 3.22 inches.

Flood in CHESTER, PENNSYLVANIA
From 02-AUG-09 14:42:00 to 02-AUG-09 15:36:00 (EST-5)
Location: DOWNINGTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain from the thunderstorms during the morning of the 2nd caused minor flooding along the East Branch of the Brandywine Creek at Downingtown during the afternoon of the 2nd. The creek was above its 7 foot flood stage from 342 p.m. EDT through 436 p.m. EDT on the 2nd. It crested at 7.09 feet at 415 p.m. EDT.

Flash Flood in BERKS, PENNSYLVANIA
From 02-AUG-09 09:00:00 to 02-AUG-09 11:00:00 (EST-5)
Location: GIBRALTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy rain caused flooding of streams as well as poor drainage flooding in southeastern Berks County from around Cumru and Robeson Townships northeast through Rockland and Pike Townships. Doppler Radar storm total estimates reached four inches within this area.

Flash Flood in LEHIGH, PENNSYLVANIA
From 02-AUG-09 10:00:00 to 02-AUG-09 12:00:00 (EST-5)
Location: COOPERSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorms with heavy rain caused flooding along the Saucon Creek in Upper Saucon Township as well as flooding along some of the smaller tributaries of the creek in Coopersburg Borough. North Main Street in Coopersburg was flooded by one of these tributaries and closed.  Doppler Radar storm total estimates reached two inches.

Flood in CHESTER, PENNSYLVANIA
From 02-AUG-09 06:08:00 to 02-AUG-09 07:01:00 (EST-5)
Location: HOWELLVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from showers and thunderstorms with heavy rain earlier on the morning of the 2nd caused minor flooding along the Valley Creek. The Valley Creek at Valley Forge was above its 7 foot flood stage from 708 a.m. EDT through 801 a.m. EDT on the 2nd. It crested at 7.5 feet at 730 a.m. EDT. The rainfall total through 7 a.m. EDT that morning at Valley Forge was 1.12 inches.

Flood in MONTGOMERY, PENNSYLVANIA
From 02-AUG-09 07:26:00 to 02-AUG-09 17:24:00 (EST-5)
Location: FT WASHINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavy rain from showers and thunderstorms earlier in the morning caused flooding along the Wissahickon Creek. The flooding was exacerbated when thunderstorms with even more heavier rain moved across Montgomery County later in the morning on the second. Please refer to the flash flood entry for Montgomery County for further details. The river gage along the Wissahickon Creek was above its 9 foot flood stage from 826 a.m. EDT through 624 p.m. EDT on the 2nd. It crested at 12.90 feet at 245 p.m. EDT.

Flood in PHILADELPHIA, PENNSYLVANIA
From 02-AUG-09 10:02:00 to 02-AUG-09 22:21:00 (EST-5)
Location: MANAYUNK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the series of thunderstorms during the first half of the day on the 2nd, espeically in Montgomery County, caused flooding along the Wissahickon Creek within Philadelphia. The Wisshaickon Creek at its mouth with the Schuylkill River was above its 5 foot flood stage from 1102 a.m. EDT through 1121 p.m. EDT on the 2nd. It crested at 7.93 feet at 615 p.m. EDT. Flooding along the Pennypack Creek at the Rhawn Street Bridge also continued into the evening. The creek was above its 7 foot flood stage from 1129 a.m. EDT through 956 p.m. EDT on the 2nd. It crested at 11.02 feet at 7 p.m. EDT.

Flash Flood in PHILADELPHIA, PENNSYLVANIA
From 02-AUG-09 10:00:00 to 02-AUG-09 16:00:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorms with torrential downpours caused flash flooding along most of the smaller creeks within Philadelphia as well as considerable urban and poor drainage flooding. The Green Tree Run was scoured by flood waters. Along the Wissahickon Creek, culverts were washed out and roads and trails were undermined. Flooding along the Pennypack Creek spread into the picnic area near Pine Road in Pennypack Park. Flooding was reported along Cobbs Creek along the border with Delaware County. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 1129 a.m. EDT through 956 p.m. EDT on the 2nd. It crested at 11.02 feet at 7 p.m. EDT. Frankford Creek at Castor Avenue was above its 7 foot flood stage from 1149 a.m. EDT through 1234 p.m. EDT on the 2nd. It crested at 9.76 feet at Noon EDT. The event precipitation total at the Philadelphia International Airport was 1.59 inches.

Flash Flood in MONTGOMERY, PENNSYLVANIA
From 02-AUG-09 10:00:00 to 02-AUG-09 16:00:00 (EST-5)
Location: NARBERTH
Flood cause: Heavy Rain
Property damage: 12.00M
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorms with torrential downpours caused flash flooding in several municipalities and a major mudslide across southern Montgomery County. Doppler Radar storm total estimates averaged between 2.5 inches and 4.5 inches.
In Lower Merion Township, a mudslide closed both directions of the Schuylkill Expressway at the Conshohocken Curve from 11 a.m. EDT through 230 p.m. EDT. The westbound lanes were reopened first and the eastbound lanes were reopened at 730 p.m. EDT. Motorists were stranded on the expressway when the mudslide initially occurred. Elsewhere in the township, the Mill Creek flooded and washed out a couple of roads in its basin. There were about a half dozen water rescues. West Mill Creek Park was closed indefinitely. The Mill Creek Pumping Station was under five feet of water. Most roads that were closed were reopened by the 3rd, but River Road was under five feet of water and rocks. In the Wynnewood section, Indian Creek also flooded.
In Upper Dublin Township, flooding occured along the Wissahickon Creek Basin and also included the Rapp and Pine Runs. The Fort Washington Office Park was severely affected and was surrounded by water. Many businesses were flooded and damaged. At least one vehicle was submerged. Ten people were evacuated from one office building.  Virginia Drive flooded was severely flooded. The Fort Washington exit ramp off of the Pennsylvania Turnpike and U.S. Route 309 were flooded and closed. A Hilton Inn on West Pennsylvania Avenue was flooded with up to three feet of water on its first floor. It was expected to be closed for a month. Damage to the Industrial Park was estimated at 10 million dollars.
In Whitpain Township, about a dozen residents were asked to evacuate from Maple Street after a culvert flooded. The BoRit asbestos site was damaged as Chestnut Avenue was flooded. In Ambler Borough, several businesses suffered water damage as up to five feet of water accumulated on Main Street. The Butler Pike was closed after a landslide. In Whitemarsh Township, one home had nine feet of water in it. About four streets were flooded. In Springfield Township, the Valley Green Inn was closed for about 24 hours because of Wissahickon Creek flooding.
Event precipitation totals included 5.19 inches in Flourtown, 4.09 inches in Willow Grove, 3.40 inches in Ambler and 2.76 inches in Blue Bell.