The combination of a stalled frontal boundary, extending from the Pennsylvania/Maryland border eastward across southern New Jersey, and a series of upper level disturbances resulted in numerous slow-moving thunderstorms from the afternoon of the 22nd through the early morning of the 23rd. These thunderstorms produced torrential rain and some wind damage.
Storm total rainfall measurements ranged mainly between 2 and 7 inches across central to northern New Jersey.  Run-off from waves of heavy precipitation resulted in areas of poor drainage and roadway flooding, with some creeks and streams also overflowing their banks. In Jackson (Ocean County), rainfall totals of 5 inches were reported in an hour.
In addition, the combination of the heavy rain and higher than normal astronomical tides associated with the full moon, caused minor tidal flooding along the tidal Delaware River and upper Delaware Bay during the overnight high tide cycles on the 22nd and lingered into the early morning high tide cycle on the 23rd. In Philadelphia, the highest tide reached 8.76 feet above mean lower low water early on the 23rd. Minor tidal flooding starts at 8.2 feet above mean lower low water.  At Reedy Island (New Castle County), the highest tide reached 7.52 feet above mean lower low water late on the 22nd. Minor tidal flooding starts at 7.2 feet above mean lower low water.

Flood in BURLINGTON, NEW JERSEY
From 23-JUL-13 08:22:00 to 23-JUL-13 12:45:00 (EST-5)
Location: MT HOLLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rain fell the night of the 22nd and again in the early morning hours of the 23rd. The runoff from all of the rain caused the Rancocas Creek to exceed its flood stage. Flooding closed Mill and King Streets as well as Rancocas-Mount Holly Road along the creek. The North Branch of the Rancocas Creek at Iron Works Park was above its 11.7 foot flood stage from 922 a.m. EDT through 145 p.m. EDT on the 23rd. It crested at 11.74 feet at 1115 a.m. EDT.

Flash Flood in GLOUCESTER, NEW JERSEY
From 23-JUL-13 01:30:00 to 23-JUL-13 02:30:00 (EST-5)
Location: OAKVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain fell through the night of the 22nd and caused urban and poor drainage flash flooding to occur during the early morning of the 23rd. Water estimated to be a foot deep was reported on Hessian Avenue in West Deptford Township.

Flash Flood in OCEAN, NEW JERSEY
From 22-JUL-13 17:15:00 to 22-JUL-13 19:30:00 (EST-5)
Location: JACKSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorms with very heavy rain caused poor drainage and small stream flash flooding in Jackson Township in Ocean County. Several roads were reported to be flooded in Jackson. Event precipitation totals included 6.07 inches in Jackson.

Flash Flood in BURLINGTON, NEW JERSEY
From 22-JUL-13 23:00:00 to 23-JUL-13 05:00:00 (EST-5)
Location: SPRINGSIDE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain fell through the night of the 22nd and caused poor drainage and small stream flash flooding to occur during the early morning of the 23rd. Several roads reported flooding through the Mount Holly/Westampton/Mount Laurel area. In Mount Holly, two homes were damaged by flooding on Cherry Street as the Buttonwood Run flooded. Part of the foundation of one home was washed away and was uninhabitable.  The other home was severely damaged, but was unoccupied.  The intersection of Rancocas Road and the Mount Holly By-Pass (County Route 541) was flooded and closed. The basement of the First Presbyterian Church also flooded. In Mount Laurel, flash flooding along Parkers Creek shut down Hartford and Union Mill Rods. Event precipitation totals included 6.71 inches in Eastampton, 6.25 inches at the Mount Holly WFO, 4.00 inches in Florence, 3.43 inches in Hainesport and 3.36 inches in Mount Laurel.

Flash Flood in CAMDEN, NEW JERSEY
From 23-JUL-13 01:45:00 to 23-JUL-13 02:15:00 (EST-5)
Location: CAMDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain fell through the night of the 22nd and caused urban and poor drainage flooding to occur during the early morning of the 23rd. The Admiral Wilson Boulevard in Camden was closed due to flooding with vehicles reported to be stuck in high waters. Route 130 in Pennsauken near Browning Road was closed due to significant flooding. Event precipitation totals included 1.97 inches in Merchantville.