Yeah, and temps above freezing for the duration (outside any particular heavy rates.). Seems like relying on rates fails about twice as often as it succeeds, at least in the piedmont.
Also, I'm not yet buying the amped up version the GFS is selling, which is our best shot at significant accumulation. The 18z GFS illustrates how an amped storm fails,by climbing too far North. It's a real tightrope. I suspect the hires NAM Is closest to how it plays out, but who knows?