Use total QPF, convert using your own ratios. In that CCB tomorrow afternoon/evening, ratios will be higher than 10:1 with incredible forcing if this look holds
That energy diving in across the Great Lakes? It helps to re-energize the trough and upper low, bringing snow straight through Tuesday and into the night...
It's gonna be tough. We might see like a 3-4" gradient west to east across Berks county. I think 12-18 is a very solid bet right now. Up towards Lehigh/Allentown/Easton it's more like 16-22+"
Imagine 30 hours out from right now one model gives Philly 3.5", and another gives Philly 17.5".... well that's the difference between the American guidance NAM and GFS. Thirty. Hours. Out.