A series of thunderstorms preceding a cold front dropped three to six inches of rain across sections of Berks County, the Lehigh Valley, Philadelphia and its nearby suburbs. This caused flash flooding and flooding of streams and creeks that started in Berks County and the Lehigh valley during the evening of the 13th and spread to the local Philadelphia area during the morning of the 14th.

Flash Flood in BERKS, PENNSYLVANIA
From 13-AUG-11 21:15:00 to 14-AUG-11 00:00:00 (EST-5)
Location: JALAPPA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with very heavy rain caused roadway flooding and flash flooding of smaller streams in Albany, Greenwich, Tilden and Windsor Townships as well as Hamburg across the northern tier of Berks County. A few homes were also flooded and a mud slide was reported in Hamburg. Event precipitation totals included 4.17 inches in Hamburg.

Flash Flood in NORTHAMPTON, PENNSYLVANIA
From 13-AUG-11 22:40:00 to 14-AUG-11 02:35:00 (EST-5)
Location: BETHLEHEM
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Flash flooding along the Monocacy Creek caused the evacuation of vendors at the Musikfest in the historical district in Bethlehem. Both the Handwerkplatz and Volksplatz were evacuated and canceled for the 14th. Some vendors lost jewelry, tubs and tablecloths. Vehicles were flooded as was some electrical equipment and tents. Several booths and propane tanks were swept away. No injuries were reported. The Monocacy Creek at Bethlehem was above its 4.5 foot flood stage from 1140 p.m. EDT on the 13th through 335 a.m. EDT on the 14th. It crested at 5.18 feet at 1 a.m. EDT on the 14th. Precipitation event totals included 5.20 inches in Bethlehem, 5.18 inches in Nazareth and 4.53 inches in Glendon.

Flash Flood in LEHIGH, PENNSYLVANIA
From 13-AUG-11 21:30:00 to 14-AUG-11 00:30:00 (EST-5)
Location: BALLIETTSVILLE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with very heavy rain caused roadway flooding and flash flooding of smaller streams across the central third of Lehigh County from Allentown, Bethlehem and Hanover westnorthwest through all of the Whitehall Townships as well as Lowhill and Weisenberg Townships. In Allentown, the heavy rain caused a roof collapse and the evacuation of thirteen people. Event precipitation totals included 4.24 inches at the Lehigh Valley International Airport, 3.90 inches in Allentown and 3.73 inches in Schnecksville.

Flood in NORTHAMPTON, PENNSYLVANIA
From 14-AUG-11 07:52:00 to 14-AUG-11 10:02:00 (EST-5)
Location: BETHLEHEM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from the heavier rain overnight and more showers and thunderstorms during the morning of the 14th caused renewed flooding along the Monocacy Creek. The Monocacy Creek at Bethlehem was above its 4.5 foot flood stage again from 852 a.m. EDT through 1102 a.m. EDT on the 14th. It crested at 4.57 feet at 945 a.m. EDT. Two day precipitation event totals included 5.20 inches in Bethlehem, 5.18 inches in Nazareth and 4.53 inches in Glendon.

Flash Flood in PHILADELPHIA, PENNSYLVANIA
From 14-AUG-11 05:51:00 to 14-AUG-11 10:45:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain from thunderstorms caused flash flooding along the Pennypack and in particular Frankford Creek in Philadelphia. The Frankford Creek at Castor Avenue was above its 7 foot flood stage from 705 a.m. EDT through 737 a.m. EDT on the 14th. It crested at 8.08 feet at 715 a.m. EDT. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 651 a.m. EDT through 821 p.m. EDT on the 14th. It crested at 7.64 feet at 415 p.m. EDT. Event precipitation totals included 5.80 inches in Rockledge and at the Philadelphia International Airport and 4.18 inches in Wyndmoor.

Flood in PHILADELPHIA, PENNSYLVANIA
From 14-AUG-11 10:45:00 to 14-AUG-11 10:45:00 (EST-5)
Location: FOX CHASE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff flooding from heavy rain continued on the Pennypack Creek through the afternoon and into the evening of the 14th. The Pennypack Creek at the Rhawn Street Bridge was above its 7 foot flood stage from 651 a.m. EDT through 821 p.m. EDT on the 14th. It crested at 7.64 feet at 415 p.m. EDT. Event precipitation totals included 5.80 inches in Rockledge and at the Philadelphia International Airport and 4.18 inches in Wyndmoor.

Flood in DELAWARE, PENNSYLVANIA
From 14-AUG-11 14:00:00 to 14-AUG-11 17:00:00 (EST-5)
Location: PRIMOS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The runoff from heavy rain earlier in the day caused flooding along the Darby Creek and closed MacDade Boulevard in Darby. Flooding was also reported in Clifton Heights between Baltimore Avenue and Springfield Road. Event precipitation totals included 6.13 in Nether Providence Township and 2.86 inches in Aston.