Showers and thunderstorms, particularly during the first half of the evening on the 27th brought very heavy rain to New Jersey and caused poor drainage and flash flooding in the southern half of the state. Soil conditions were wetter than usual for late June leading into this event and made it easier for flooding to occur. Event precipitation totals reached two to five inches in central and southern New Jersey and one to two inches in the northern third of the state. Lighter showers arrived during the morning on the 27th. Precipitation remained fairly light until later in the afternoon. The heaviest rain fell during the first half of the evening. The showers and thunderstorms ended during the late evening on the 27th. The heavy precipitation was caused by an anomalously strong low pressure that moved through the Ohio Valley on the 27th. Its warm front moved northeast through the southeast half of New Jersey during that evening as a secondary low pressure system formed along it. Thunderstorms with the very heavy rain developed in the warm sector south of the front and waves of thunderstorms moved through the southeast part of the state.
The heavy rain on the 27th continued the trend of a very wet month of June across New Jersey.  The June New Jersey statewide average precipitation of 8.21 inches (nearly twice of the 4.19 inch normal) was the fourth wettest on record dating back to 1895. At the Atlantic City International Airport, the monthly precipitation total of 8.36 inches was the 2nd wettest June on record. In Trenton (Mercer County), the June precipitation total of 6.33 inches was 1.92 inches wetter than normal.

Flash Flood in ATLANTIC, NEW JERSEY
From 27-JUN-15 19:30:00 to 27-JUN-15 22:30:00 (EST-5)
Location: HAMMONTON MUNI ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with very heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in northern Atlantic County, mainly in and around Hammonton and Folsom.  In Hammonton Township, Packard Street and Bellevue Avenue were closed due to flash flooding. Flooding was also reported along New Jersey State Route 54.  Event precipitation totals included 3.49 inches in Hammonton, 3.22 inches in Folsom and 2.69 inches at the Atlantic City International Airport.

Flash Flood in OCEAN, NEW JERSEY
From 27-JUN-15 19:30:00 to 28-JUN-15 00:00:00 (EST-5)
Location: TUCKERTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with very heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in eastern Ocean County from Toms River Township south through Little Egg Harbor Township.  Event precipitation totals included 4.71 inches in Brick Township, 4.49 inches in Berkeley Township, 4.41 inches at Robert J. Miller Airport, 4.26 inches in Toms River, 3.73 inches in Little Egg Harbor Township, 3.70 inches in Pine Beach, 3.51 inches in Stafford Township, 2.90 inches in Tuckerton and 2.25 inches in Lacey Township.

Flash Flood in CUMBERLAND, NEW JERSEY
From 27-JUN-15 18:45:00 to 27-JUN-15 22:00:00 (EST-5)
Location: SOUTH VINELAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorms with very heavy rain caused flash flooding in central Cumberland County affecting Millville and Vineland the hardest. In Vineland, vehicles were submerged on Butler and Sherman Avenues. Flooding also occurred along New Jersey State Route 47. Event precipitation totals included 4.20 inches in Vineland, 4.07 inches in Millville and 2.94 inches in South Vineland.

Flash Flood in CAMDEN, NEW JERSEY
From 27-JUN-15 19:40:00 to 27-JUN-15 22:30:00 (EST-5)
Location: BRADDOCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with very heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in southern Camden County in Winslow Township.  Flooding was reported along New Jersey State Route 73 as well as on U.S. Route 30 (White Horse Pike). Event precipitation totals included 2.86 inches in Winslow Township, 2.67 inches in Berlin Township and 1.93 inches in Haddonfield.

Flash Flood in OCEAN, NEW JERSEY
From 27-JUN-15 20:45:00 to 27-JUN-15 23:00:00 (EST-5)
Location: BARNEGAT LIGHT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorms with heavy rain caused poor drainage flash flooding on Long Beach Island. Roadways near Barnegat Inlet were impassable. Surf City also closed Barnegat Avenue Event precipitation totals included 2.26 inches in Point Pleasant Beach, 1.70 inches in Surf City and 1.63 inches in Seaside Heights.

Flash Flood in ATLANTIC, NEW JERSEY
From 27-JUN-15 19:05:00 to 27-JUN-15 22:00:00 (EST-5)
Location: MINOTOLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Thunderstorms with very heavy rain caused flash flooding in Buena Borough. U.S. Route 40 was flooded and closed near the Deep Run. Event precipitation totals included 3.27 inches in Buena Vista Township.

Flash Flood in BURLINGTON, NEW JERSEY
From 27-JUN-15 20:00:00 to 27-JUN-15 23:00:00 (EST-5)
Location: NEW GRETNA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with very heavy rain caused flash flooding of smaller streams as well as poor drainage flooding in southeastern Burlington County.  Event precipitation totals included 4.46 inches in Chatsworth, 3.39 inches in Oswego Lake, 2.53 inches in Shamong Township and 2.23 inches in Westampton Township.