A lee side trof preceding a cold front (that moved through overnight on thee 22nd) helped trigger a series of showers and thunderstorms with heavy rain across the central third of New Jersey from the morning into the middle of the afternoon on the 22nd.  Event precipitation totals reached 1.5 to 3.5 inches across sections of Mercer, Middlesex, Morris and Somerset Counties and even reached close to 6.0 inches in far northwest Somerset County which had the greatest impact. The heavy rain caused flash flooding of smaller streams, roadways and rivers and also led to flooding along the North Branch of the Raritan River that persisted into the evening of the 22nd.

Flash Flood in SOMERSET, NEW JERSEY
From 22-AUG-13 09:30:00 to 22-AUG-13 12:00:00 (EST-5)
Location: BASKING RIDGE ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with torrential downpours caused flash flooding of roadways and streams in northwestern Somerset County and hit Bedminister, Peapack-Gladstone and Bernardsville the hardest. The flash flooding affected New Jersey Commuter Rail Service. Eastbound commuter rail service along the Morris and Essex Line was suspended for the day after flash flooding caused four to six washouts of stone supports along the Gladstone Branch tracks. Westbound service continued, but delays averaged 45 minutes.  Substitute eastbound bus service was provided. About ten people in Peapack-Gladstone self evacuated to the Municipal Building. The runoff from the heavy rain and also caused flooding along the Lamington River and Middle Brook.  Event precipitation totals included 5.85 inches in Peapack-Gladstone, 5.14 inches in Pottersville, 4.94 inches in Far Hills and 3.99 inches in Middlebush.

Flood in SOMERSET, NEW JERSEY
From 22-AUG-13 12:00:00 to 22-AUG-13 21:55:00 (EST-5)
Location: LAMINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The runoff from the heavy rain earlier in the day caused flooding to persist along sections of the Middle Brook, the Lamington River and the North Branch of the Raritan River.  The Lamington River at Burnt Mills was above its 9.5 foot flood stage from 147 p.m. EDT through 815 p.m. EDT on the 22nd. It crested at 12.00 feet at 5 p.m. EDT. It was its highest crest since 12.1 feet on April 15, 2007.  The Middle Brook at Burnt Mills was above its 8 foot flood stage from 1131 a.m. EDT through 428 p.m. EDT on the 22nd. It crested at 9.75 feet at 115 p.m. EDT.  The North Branch of the Raritan River at North Branch was above its 12.3 foot flood stage from 519 p.m. EDT through 933 p.m. EDT on the 22nd. It crested at 13.51 feet at 730 p.m. EDT.  Farther downstream, the North Branch of the Raritan River at the village of South Branch was above its 7 foot flood stage from 937 p.m. EDT through 1055 p.m. EDT on the 22nd. It crested at 7.07 feet at 1045 p.m. EDT.   Event precipitation totals included 5.85 inches in Peapack-Gladstone, 5.14 inches in Pottersville, 4.94 inches in Far Hills, 3.99 inches in Middlebush, 3.52 inches in Hillsborough, 3.50 inches in Manville, 3.02 inches in Bridgewater, 2.90 inches in Franklin and 1.88 inches in Montgomery Township.

Flood in BURLINGTON, NEW JERSEY
From 22-AUG-13 06:45:00 to 22-AUG-13 08:00:00 (EST-5)
Location: FIELDSBORO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rain that coincided with the morning commute in Burlington County caused poor drainage flooding along Interstate 295 between Bordentown and Interstate 195. This caused traffic to back up for nearly ten miles. U.S. Route 130 was closed in Florence Township. Event precipitation totals included 2.00 inches in Bordentown and 1.75 inches in Florence Township.

Flash Flood in MORRIS, NEW JERSEY
From 22-AUG-13 09:45:00 to 22-AUG-13 12:00:00 (EST-5)
Location: MIDDLE VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with heavy downpours caused flash flooding of roadways and smaller streams in southern Morris County in Chester, Mendham and Washington Townships.  Event precipitation totals included 2.00 inches in New Vernon, 1.76 inches in Washington Township,  1.59 inches in Chester Township and 1.53 inches in Mendham Township.

Flash Flood in MERCER, NEW JERSEY
From 22-AUG-13 13:00:00 to 22-AUG-13 15:00:00 (EST-5)
Location: HARBOURTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy downpours caused flash flooding of roadways and smaller streams mainly in the northwestern and central sections of Mercer County.  The afternoon thunderstorms were most concentrated in Hopewell and Lawrence Townships. Roadway and creek flooding were reported in Hamilton, Princeton and Lawrence Townships.  Event precipitation totals included 2.62 inches in Hamilton Township, 2.23 inches in Pennington, 2.11 inches in Lawrence, 2.05 inches in Hopewell and 1.80 inches in Trenton.

Flash Flood in HUNTERDON, NEW JERSEY
From 22-AUG-13 10:00:00 to 22-AUG-13 12:00:00 (EST-5)
Location: ALLERTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy downpours caused flash flooding of roadways and smaller streams in northeastern Hunterdon County and affected Clinton, Tewksbury and Readington Townships the hardest.  In Tewksbury Township, a car became trapped in five feet of flood waters from the Lamington (Black) River on McCan Mill Road near the bridge at Black River Road. A front end loader was used to rescue the female driver. A vehicle was also stuck in flood waters on Rockaway Road. Flooding and road closures also occurred along U.S. Route 22 in Readington and Clinton Townships. Event precipitation totals included 3.15 inches in Lebanon Township, 3.06 inches in Califon and 1.62 inches in Clinton and Readington Townships.

Flash Flood in SOMERSET, NEW JERSEY
From 22-AUG-13 12:30:00 to 22-AUG-13 15:00:00 (EST-5)
Location: PLUCKEMIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with heavy downpours caused flash flooding of roadways and smaller streams again in Somerset County, this time in the southern part of the county. The heaviest rain from this cluster of thunderstorms fell in Hillsborough and Franklin Townships.  In Hillsborough Township, U.S. Route 206 and Brooks Boulevard were flooded and closed. In Franklin Township, How Lane and New Jersey State Route 27 were flooded and closed. Event precipitation totals included 3.52 inches in Hillsborough, 3.50 inches in Manville, 2.90 inches in Franklin and 1.88 inches in Montgomery Township.

Flash Flood in MIDDLESEX, NEW JERSEY
From 22-AUG-13 12:00:00 to 22-AUG-13 15:00:00 (EST-5)
Location: NEW BRUNSWICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy downpours caused flash flooding of roadways and smaller streams in central and northern Middlesex County affecting North Brunswick and East Brunswick the hardest. In East Brunswick, numerous roadways were flooded (including New Jersey State Routes 18 and 27) and traffic was described as at a standstill. In New Brunswick, the basement of the Middlesex County Family Court was flooded and Family Court was closed for the rest of the day.  Joyce Kilmer Avenue, George Street, Johnson Drive and Livingston Avenue were all flooded. Buccleuch Park was closed. In Edison, New Jersey State Route 27 was flooded. Street flooding was also reported in Woodbridge. Event precipitation totals included 2.00 inches in Cranbury and 1.90 inches in New Brunswick.