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The National Weather Service was predicting up to 18 inches of snow in the northernmost part of the state, with between 6 inches and a foot possible across Sussex, Warren, Morris, Hunterdon, Somerset, Passaic, Bergen, and western Essex counties, where a Winter Storm Warning was issued.
Murphy said the most intense stretch of precipitation, beginning as rain and turning to snow, will happen in the middle of the night and run into mid-morning Tuesday.
Minor to moderate coastal flooding with heavy winds, between 35 to 40 mph, were expected, Murphy said, urging residents to go slow and plan for extra time.
A ban of commercial vehicles on roadways goes into effect at midnight. State officers will open at 10 a.m.
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