An inverted trough that brought freezing rain in the morning acted as a conduit to bring heavy rain into the region from the mid morning into the mid afternoon of the 18th. The rain itself ended during the early evening on the 18th.  Event precipitation totals averaged close to two inches and caused considerable poor drainage flooding as well as flooding along some smaller creeks and rivers mainly in the central third of New Jersey. The most reported flooding occurred in Somerset County where flooding persisted into the 20th.  Most other creek and small river flooding ended by late in the evening on the 18th. Once the flooding subsided, sub freezing temperatures caused black ice problems in locations where leftover water ponded and did not drain.

Flood in HUNTERDON, NEW JERSEY
From 18-JAN-15 16:04:00 to 18-JAN-15 20:46:00 (EST-5)
Location: COPPER HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Neshanic River at Reaville had minor flooding and was above its 6.5 foot flood stage from 404 p.m. EST through 846 p.m. EST on the 18th. It crested at 7.39 feet at 6 p.m. EST.  Event precipitation totals included 1.64 inches in Readington Township, 1.63 inches in Flemington and 1.31 inches in Clinton.

Flood in MERCER, NEW JERSEY
From 18-JAN-15 14:00:00 to 18-JAN-15 22:00:00 (EST-5)
Location: PRINCETON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused flooding along the Stony Brook and closed Quaker Road (County Route 533) in Princeton. In addition, poor drainage flooding closed Terhune Road between Walnut Lane and Jefferson Road in Princeton Township.  Event precipitation totals included 2.08 inches in Ewing, 1.96 inches in Hamilton and Trenton, 1.94 inches in Princeton and 1.84 inches in East Windsor.

Flood in SOMERSET, NEW JERSEY
From 18-JAN-15 18:27:00 to 20-JAN-15 16:05:00 (EST-5)
Location: BRANCHBURG PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused poor drainage flooding as well as flooding along waterways in Somerset County.  In Hillsborough Township, high water advisories were in effect on Millstone River Road between Manville and Franklin Drives. Elsewhere in the township, Riverside Drive was closed between Mill Lane and Clawson Avenue along the South Branch of the Raritan River.  In Branchburg Township, the Black Point Road Bridge was closed over the South Branch of the Raritan River.

The Millstone River at Griggstown had moderate flooding and was above its 10 foot flood stage from 627 p.m. EST on the 18th through 405 p.m. EST on the 20th. It crested at 12.91 feet at 915 a.m. EST on the 19th. Farther downstream, the Millstone River at Blackwells Mills had minor flooding and was above its 9 foot flood stage from 11 a.m. EST through 430 p.m. EST on the 19th. It crested at 9.05 feet at 100 p.m. EST.  The North Branch of the Raritan River at the village of South Branch had minor flooding and was above its 8 foot flood stage (the established flood stage was raised at this site) from 724 p.m. EST through 1130 p.m. EST on the 18th. It crested at 8.18 feet at 830 p.m. EST.
Event precipitation totals included 2.29 inches in Franklin Township, 2.05 inches in Bound Brook, 1.92 inches in Montgomery Township, 1.90 inches in Hillsborough Township, 1.88 inches in Raritan and Somerville and 1.78 inches in Branchburg.

Heavy Rain in MIDDLESEX, NEW JERSEY
From 18-JAN-15 11:00:00 to 18-JAN-15 18:00:00 (EST-5)
Location: MILLTOWN ZIGFIELD AR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused some poor drainage flooding in Middlesex County. In East Brunswick Township,  Dunhams Corner Road and Church Lane were closed. In Old Bridge Township, Cantrell Road was closed. Event precipitation totals included 2.24 inches in Cranbury Township, 1.90 inches in Old Bridge Township and New Brunswick, 1.88 inches in South River and Woodbridge and 1.86 inches in East Brunswick Township.

Flood in BURLINGTON, NEW JERSEY
From 18-JAN-15 13:00:00 to 18-JAN-15 21:00:00 (EST-5)
Location: HARTFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flooding along Parkers Creek and closed both Union Mill and Hartford Roads in the vicinity of the creek in Mount Laurel Township.  Event precipitation totals included 1.99 inches in Mount Laurel, 1.96 inches in Medford and 1.95 inches in Moorestown.