The combination of an approaching cold front and tropical moisture that moved into the region from a decaying low pressure system over the Carolinas produced heavy rain over Eastern Pennsylvania between 6 a.m. EDT and 6 p.m. EDT on the 28th. This caused flooding and flash flooding, especially in or near the Lehigh Valley.

Flood in NORTHAMPTON, PENNSYLVANIA
From 28-SEP-08 11:30:00 to 28-SEP-08 16:00:00 (EST-5)
Location: WESTGATE HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain during the day on the 28th led to poor drainage and roadway flooding in and around Bethlehem. The heavy rain also caused the Monocacy Creek in Bethlehem to reach flood stage during the afternoon. The Celtic Classic held in Johnston Park in Bethlehem was affected by its flooding. About six food vendors and twenty craft merchants were flooded. About 100 workers were forced to evacuate their location. That part of the park was covered by two feet of water. Performing acts were also moved to other stages. The Monocacy Creek at the gage site in Bethlehem was above its 4.5 foot flood stage from 305 p.m. EDT through 346 p.m. EDT on the 28th. It crested at 4.53 feet at 330 p.m. EDT. The precipitation total for the 28th from the Lehigh Valley International Airport was 3.83 inches.

Flood in DELAWARE, PENNSYLVANIA
From 28-SEP-08 12:00:00 to 28-SEP-08 15:00:00 (EST-5)
Location: WAYNE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A series of showers and thunderstorms with heavy rain between 330 p.m. and 530 p.m. EDT caused flooding in Radnor Township. Doppler Radar storm total estimates reached 2.5 inches. Ithan Creek rose over Iven Road in the Saint Davids area of the township. Other flooding occurred along South Wayne Avenue and West Wayne Avenue. A vehicle became stuck underneath the Radnor Trail Bridge.

Flash Flood in BUCKS, PENNSYLVANIA
From 28-SEP-08 14:00:00 to 28-SEP-08 16:00:00 (EST-5)
Location: KINTNERSVILLE
Flood cause: Heavy Rain
Property damage: 750.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Showers and thunderstorms with heavy rain caused the flooding and washouts of a few roads in Durham and Nockamixon Townships. A large mudslide occurred across Pennsylvania State Route 611 in Durham Township and closed it. Other major roads closed in the area included Center Hill and Kintner Hill Roads. Water poured down the embankment of Pennsylvania State Route 212 overran a house on Old Furnace Road. The water broke windows, filled the basement with water and tore away the driveway. The rush of water also scattered boulders and smaller rocks that clogged Rodges Run under two bridges on Lehnenberg Road. Pennsylvania State Route 611 was closed in both directions until the 29th. Flooding along Gallows Run and rock slides caused the road to be closed from Pennsylvania State Route 212 to Centerhill Road. In Nockamixon Township, a 170-year-old stone wall collapsed under the weight of water cascading off the steep cliffs that hug the southbound side of River Road. The rain overflowed a culvert off the cliff side of the road, washed across the roadway, filled the canal and shattered the wall. Repairs were estimated at $500,000. A homeowner on River Road in the township saw hundreds of rocks carried onto his property by a flooding stream and then onto River Road. The stream knocked down 100 feet of fencing and carried away a propane tank. The precipitation total for the 28th from the Lehigh Valley International Airport was 3.83 inches.