The strong nor'easter dropped heavy precipitation, primarily in the form of rain during the day on 9th. Storm total amounts on the day averaged 1 to 3 inches across the state with the highest amounts along the coastal counties. This caused poor drainage flooding, especially across east central New Jersey. The flooding was exacerbated further near the high tide cycle that morning. Isolated river flooding also occurred. Precipitation started before sunrise on the 9th and fell at its heaviest during the first half of the day. The rain tapered off and ended from south to north during the afternoon and evening of the 9th.
The heavy precipitation was  caused by a low pressure system that formed off the Carolina coastal waters on the 8th. It tracked northward and deepened as it reached the Delmarva coastal waters at 7 a.m. EST on the 9th. The low pressure system deepened 12 millibars in six hours and was off the New Jersey coastal waters at 1 p.m. EST on the 9th. The track and rapid intensification helped bring moisture from the Atlantic Ocean into New Jersey.  The low pressure system stopped intensifying and drifted off to the northeast reaching the Rhode Island coastal waters during the evening of the 9th and eastern Massachusetts around Midnight EST on the 10th.  This ended the heavy rain in the state.

Flood in SOMERSET, NEW JERSEY
From 09-DEC-14 13:51:00 to 11-DEC-14 05:52:00 (EST-5)
Location: GRIGGSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The runoff from heavy rain, especially in the headwater region of the Millstone River caused minor flooding along the Millstone River at Griggstown. The Griggstown Causeway was closed.  The Millstone River at Griggstown was above its 10 foot flood stage from 151 p.m. EST on the 9th through 552 a.m. EST on the 11th. It crested at 11.76 feet at 5 a.m. EST on the 10th. Event precipitation totals included 1.45 inches in Peapack, 1.40 inches in Montgomery Township, 1.25 inches in Hillsborough Township and 1.22 inches in Bridgewater Township.

Heavy Rain in MONMOUTH, NEW JERSEY
From 09-DEC-14 05:00:00 to 09-DEC-14 15:00:00 (EST-5)
Location: ALLENHURST
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy rain caused poor drainage flooding in Monmouth County, especially near and along the coast. One vehicle was stuck in flood waters in Ocean Township. Event precipitation totals included 3.17 inches in Belmar, 3.14 inches in Ocean Township, 3.10 inches in Manasquan, 2.86 inches in Long Branch and 2.78 inches in Wall Township.

Heavy Rain in MIDDLESEX, NEW JERSEY
From 09-DEC-14 05:00:00 to 09-DEC-14 15:00:00 (EST-5)
Location: OLD BRIDGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy rain caused poor drainage flooding in Middlesex County.   Event totals included 2.07 inches in Old Bridge, 1.63 inches in Woodbridge and 1.50 inches in South Brunswick.

Heavy Rain in OCEAN, NEW JERSEY
From 09-DEC-14 05:00:00 to 09-DEC-14 15:00:00 (EST-5)
Location: BRETON WOODS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused poor drainage flooding in Ocean County, especially near and along the coast. This compounded the coastal flooding. On the mainland of Ocean County, poor drainage flooding caused westbound lane closures on  New Jersey State Route 72 in both Barnegat and Stafford Townships.  Event precipitation totals included 3.12 inches in Point Pleasant, 3.06 inches in Lavallette, 3.03 inches in Lacey Township, 2.90 inches in Brick Township, 2.20 inches in Stafford Township and 2.17 inches in Manahawkin.