The warm punch has been modeled for at least the last 24hrs it was a clear and present danger. Also all the snow maps that have been flying around with 10:1 ratios are garbage and now you know why.
I'm forecasting on the low end about 8-9" here in far northwest Bucks. The warm punch means business and I think most of the snow is the WAA thump, after the sleet think the change back to snow will yield very little additional accumulation.