A winter storm brought a heavy mixture of snow, some sleet and freezing rain to the Raritan Valley and northwest New Jersey with less of a wintry impact to the rest of central and southwest New Jersey on the first into the second. The storm greatly impacted the morning commute on the 2nd in the northwest part of the state.
Precipitation started as snow throughout the northern half and southwest part of New Jersey during the evening of the 1st. Precipitation fell as rain in the southeast part of the state throughout the event.  In southwest New Jersey, the snow transitioned briefly to sleet and then rain early on the 2nd. The rain briefly changed to snow before ending in the mid afternoon on the 2nd. In the Raritan Valley and in Mercer and Monmouth Counties, precipitation transitioned to rain during the early morning on the 2nd and then changed back to freezing rain, then sleet and ultimately snow during the second half of the morning and early afternoon.  The snow ended during the mid afternoon on the 2nd. In northwest New Jersey including the Passaic Basin, the snow transitioned to a sleet and/or freezing rain mixture during the morning of the 2nd, then changed back to snow by early afternoon and ended during the middle of the afternoon on the 2nd.
Speed restrictions were in place on most major roadways in central and northern New Jersey on the 2nd.  Speed restrictions were also in place on all of the Delaware River bridges in the Philadelphia Metropolitan area.  In northern New Jersey, accidents were reported on Interstates 78 and 80 in Warren and Hunterdon Counties. Many schools in northwest New Jersey were closed on the 2nd. Many schools in central New Jersey had delayed openings on the 2nd.  Even after the snow changed to rain in central New Jersey problems persisted as snow clogged catch basins led to flooded roadways in Somerset and Middlesex Counties.  Heavier snow showers on the afternoon of the 2nd forced the closure of bridges in Highlands and Rumson in Monmouth County.
Representative snowfall included 8.1 inches in Green Pond (Morris County), 8.0 inches in Marcella (Morris County) and Montague (Sussex County), 7.5 inches in Lebanon (Hunterdon County), 7.1 inches in Columbia (Warren County), 7.0 inches in Hamburg (Sussex County), 6.0 inches in Boonton (Morris County) and Hackettstown (Warren County), 4.3 inches in Freehold (Monmouth County), 4.0 inches in Stanton (Hunterdon County), 3.2 inches in Edison (Middlesex County), 3.0 inches in Bridgewater Township (Somerset County), 2.6 inches in New Brunswick (Middlesex County), 2.0 inches in Florence (Burlington County) and Jackson Township (Ocean County), 1.9 inches in Ewing (Mercer County), 1.2 inches in Washington Township (Gloucester County) and 1.1 inches in Westampton (Burlington County).
Ice accumulations reached as high as one to two tenths of an inch in the Raritan Valley and averaged less than one tenth of an inch in the Passaic Basin.
The winter storm was caused by a low pressure system that moved from the lower Missouri Valley on the morning of the 1st eastward into Indiana on the evening of the 1st and western Pennsylvania early on the 2nd. During the mid morning of the 2nd, a secondary low pressure formed in the northern Delmarva Peninsula. It quickly became the primary low pressure system and exited to the east. At 1 p.m. EST on the 2nd it was just southeast of Montauk Point, Long Island. An arctic high pressure system that moved in tandem with the low pressure system across the southern tier of Canada prevented the low from traveling farther to the north and also kept a sufficient supply of cold air for precipitation to remain a wintry mix in most of the northern half of the state.

Winter Storm in SUSSEX, NEW JERSEY
From 01-FEB-15 18:00:00 to 02-FEB-15 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WARREN, NEW JERSEY
From 01-FEB-15 18:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in MORRIS, NEW JERSEY
From 01-FEB-15 19:00:00 to 02-FEB-15 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in SOMERSET, NEW JERSEY
From 01-FEB-15 19:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Storm in HUNTERDON, NEW JERSEY
From 01-FEB-15 18:00:00 to 02-FEB-15 13:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MIDDLESEX, NEW JERSEY
From 01-FEB-15 20:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN MONMOUTH, NEW JERSEY
From 01-FEB-15 21:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MERCER, NEW JERSEY
From 01-FEB-15 23:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in EASTERN MONMOUTH, NEW JERSEY
From 01-FEB-15 22:00:00 to 02-FEB-15 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHWESTERN BURLINGTON, NEW JERSEY
From 01-FEB-15 22:30:00 to 02-FEB-15 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Winter Weather in CAMDEN, NEW JERSEY
From 01-FEB-15 22:30:00 to 02-FEB-15 01:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Winter Weather in GLOUCESTER, NEW JERSEY
From 01-FEB-15 22:30:00 to 02-FEB-15 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter