An approaching cold front triggered thunderstorms with heavy downpours across northern New Jersey during the second half of the afternoon into the early evening of the 13th.  This was in addition to the heavy rain that fell across northern New Jersey from the afternoon of the 12th into the morning of the 13th preceding the same system's warm front. Total event precipitation totals averaged between 2.0 and 3.5 inches. The initial shot of heavy rain left the ground nearly saturated and vulnerable to flash flooding which occurred in parts of Warren, Morris and Middlesex Counties that afternoon and early evening.
In addition, the combination of the preceding onshore flow and spring tides associated with the full moon caused minor tidal flooding during the evening high tide cycle on the 13th along the ocean. The high tide reached 6.30 feet above mean lower low water at Atlantic City (Atlantic County). Minor tidal flooding starts at 6.00 feet above mean lower low water. The high tides reached 7.16 feet above mean lower low water at Cape May (Cape May County) and 6.98 feet above mean lower low water at Sandy Hook (Monmouth County). Minor tidal flooding starts at 6.70 feet above mean lower low water.  The tidal influenced Watson Creek at Manasquan (Monmouth County) crested just barely above its 6 foot flood stage at 6.02 feet at 851 p.m. EDT on the 13th. While the highest tides occurred on the evening of the 13th, lesser minor tidal flooding also occurred on the evening of the 12th in Sandy Hook, the evenings of the 11th, 12th and 14th in Atlantic City and the evenings of the 11th, 12th, 14th and 15th in Cape May.  Minor tidal flooding also occurred along tidal sections of the Delaware River and its tributaries overnight on the 13th. The high tide in Philadelphia reached 8.46 feet above mean lower low water early on the 14th. Minor tidal flooding starts at 8.20 feet above mean lower low water.

Flash Flood in MIDDLESEX, NEW JERSEY
From 13-JUN-14 16:35:00 to 13-JUN-14 18:30:00 (EST-5)
Location: KEASBEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with heavy rain caused poor drainage and small stream flash flooding in Metuchen. Flooding was reported along Main Street and New Jersey State Route 27 in Metuchen.  Entire event precipitation totals included 2.00 inches in Woodbridge.

Flash Flood in WARREN, NEW JERSEY
From 13-JUN-14 14:30:00 to 13-JUN-14 17:30:00 (EST-5)
Location: PHILLIPSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with heavy rain caused poor drainage and small stream flash flooding in southwest Warren County centered in and around Phillipsburg as well as Mansfield and Franklin Townships. Road closures were reported in both municipalities. Entire event precipitation totals included 3.52 inches in Mansfield Township, 3.29 inches in Greenwich Township, 3.11 inches in Stewartsville, 2.88 inches in Washington Township and 2.57 inches in Hope.

Flash Flood in MORRIS, NEW JERSEY
From 13-JUN-14 16:10:00 to 13-JUN-14 18:00:00 (EST-5)
Location: HANOVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with heavy rain caused poor drainage and small stream flooding in East Hanover Township. New Jersey State Route 10 was closed within the township with some underpasses totally submerged. Entire event precipitation totals included 2.41 inches in Denville, 2.28 inches in Mendham Township and 2.11 inches in Mine Hill Township.