The storm already has delivered its first surprise: Snow amounts overnight were expected to be light -- but not quite this light. In and around Philadelphia they have been negligible.
Light snow and freezing rain continues to fall on glazed roads and cars in much of rhe region, but the heavier precipitation is staying farther north toward Reading and Allentown.
We're still anticipating a lull before the stronger storm approaches with heavier precipitation later this afternoon or this evening.
That's the source of all the concern and the reason winter-storm warnings remain for Chester, Montgomery and Bucks Counties, and a watch for Philadelphia and South Jersey.
Lee Robertson at the National Weather Service in Mount Holly says it's possible that it will hold off until afer the evening commute, but it's going to be close.
It's also not clear how much of that rain is going to be freezing. At least some ice accumulation is all but certain north and west of the city, and Philadelphia is going to be right on the borderline.
If warm air arrives in time, areas from Philadelphia south and east would see minimal frozen precipitation.
This is a fluid situation, obviously, and we'll keep you apprised.