But in north and central Pennsylvania, snow accumulations could reach 4 to 8 inches.
Philadelphia public and Roman Catholic schools are among hundreds of districts announcing closings for Wednesday.
West Pottsgrove Township has declared a snow emergency until further notice.
Pittsburgh Public Schools have canceled classes along with scores of districts in western Pennsylvania that also closed or have delays. Rain and freezing temperatures are causing icy secondary roads, but major highways are mostly wet with few accidents being reported.
Up to four inches of snow is forecast south of Interstate 80 and up to eight inches more north of that line in western Pennsylvania.
Snow slowing NJ commuters
Snow is starting to turn to sleet and freezing rain across New Jersey. But motorists need to allow extra time during the rush-hour storm until temperatures rise and the precipitation turns to rain.
Many schools have closed or have delayed opening.
The speed limit has been reduced to 35 mph along the entire length of the New Jersey Turnpike for plowing.
Turnpike spokesman Joe Orlando says it's the 20th weather event of the season, but the first time crews have snow to plow.
Orlando says the Garden State Parkway is down to blacktop in many spots, but motorists need to be cautious.
Transportation Department spokeswoman Erin Phalon says over 900 plows and salt spreaders are on state highways.
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