Warren roads were slippery, and conditions from late afternoon through midnight were expected to the worst.
"Please advise motorists to stay off the roadway to allow the municipal, county, and state workers do their jobs," said Police Lt. Herbert Hentschel.
A number of activities were called off due to the snow on Tuesday night, including the Board of Education meetings cancelled in Warren Township, and for the Watchung Hills Regional High School, as well as orientation for eighth grade parents at Watchung Hills HS.
Snow was expected to intensify through the evening, with storm totals of 8 to 12 inches, police said.
The National Weather Service was predicting 100 percent chance of snow overnight, with a total accumulation expected of 5 to 9 inches during the day, and another 3 to 5 inches into the early morning hours. The temperature in northern Somerset County was predicted at 7 degrees, with blowing conditions to prevail.