A series of showers and thunderstorms withe heavy rain caused flash flooding in the northwest part of the state during the morning of the 1st. While additional showers and thunderstorms occurred during the afternoon, they were not as heavy. Doppler Radar storm total estimates ranged from 1.5 to 4.5 inches in Somerset, Hunterdon, Warren, Morris and Sussex Counties. The heaviest rain fell in Warren County along the Delaware River. The nearly stationary frontal boundary that has been responsible for heavy rain started to retrograde westward as a Bermuda High pressure system moved west from the Atlantic Ocean.

Flash Flood in MORRIS, NEW JERSEY
From 01-JUL-13 08:30:00 to 01-JUL-13 10:30:00 (EST-5)
Location: DENVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorms with heavy rain caused small stream and poor drainage flash flooding in Parsippany-Troy Hills Township. Eastbound Interstate 80 was flooded as was Interstate 287 in both directions. The ramp from Interstate 80 to Interstate 287 was also flooded. Ramps onto U.S. Route 46 and Interstate 80 were also flooded and closed. Several streets within the township were covered with rapidly flowing water. East of Morristown, the Columbia Turnpike exit east of New Jersey State Route 24 was flooded and closed. Event precipitation totals included 2.23 inches in Parsippany and 2.19 inches in Morristown.

Flash Flood in SOMERSET, NEW JERSEY
From 01-JUL-13 08:03:00 to 01-JUL-13 11:00:00 (EST-5)
Location: NORTH BRANCH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorms with heavy rain caused small stream and poor drainage flash flooding as well as field flooding in the northwest part of Somerset County centered in and around Bridgewater, Branchburg, Bedminster and Bernards Townships. The North Branch area was flooded in Branchburg Township. Burnt Mills Road was flooded and closed as was New Jersey State Route 28 (Easton Turnpike) at the North Branch Bridge. In Bridgewater Township, flooding along U.S. Route 22 blocked the eastbound entrance to Interstate 287. A few flooded roadways had rapidly moving water passing over them in Bernards Township. This included left lane flooding on Interstate 287 that necessitated a closure.  Doppler Radar storm total estimates reached around three inches in the township and street flooding was reported. Event precipitation totals included 2.34 inches in Bernards Township and 2.29 inches in Basking Ridge.

Flash Flood in WARREN, NEW JERSEY
From 01-JUL-13 05:00:00 to 01-JUL-13 10:00:00 (EST-5)
Location: COLUMBIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorms with heavy rain caused small stream and poor drainage flash flooding in northwest Warren County in Knowlton, Pahaquarry, and Hardwick Townships and affected the Worthington State Forest area the hardest.  Doppler Radar storm total estimates nearly reached 5 inches in the northwest part of the county. Event precipitation totals included 2.90 inches in Hope and 1.94 inches in Pequest.

Flash Flood in HUNTERDON, NEW JERSEY
From 01-JUL-13 07:30:00 to 01-JUL-13 10:30:00 (EST-5)
Location: ROSEMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms with heavy rain caused small stream and poor drainage flash flooding in central Hunterdon County from Kingwood and Alexandria Townships northeastward through Readington and Tewksbury Townships. U.S. Route 22 in Readington Township was flooded in both directions as was Interstate 78 in Clinton Township. In Readington Township, the approach to the Rockefellow Mills Bridge over the South Branch of the Raritan River was flooded. Flooding was reported along the South Branch of the Rockaway Creek in Whitehouse Station, the Neshanic River at Reaville (crested at 6.94 feet), the South Branch of the Raritan River near Stanton and the Mulhockaway Creek in Clinton. The Beaver Brook flooded into the parking lot of the municipal building in Clinton.  Widespread street flooding was reported in Kingwood Township. Doppler Radar storm total estimates reached around 3 inches in this band and actual storm totals included 2.50 inches in Readington Township, 2.41 inches in Franklin Township, 2.40 inches in Lebanon Township, 2.34 inches in Frenchtown, 2.08 inches in Stockton, 1.95 inches in Pittstown and 1.71 inches in Kingwood.