Last comment on 12z Nam, if you look at the 84hrs Conus surface map, there was a lot of precip to go. It was definitely heading toward the long long duration scenario of one form of precip or another.
That was the first huge sign to me the upgraded Euro stunk because the night before (0z) it dropped 20"+ imby, then the next run was 12"+, and I ended up with 3"+.
Yes, and remember a couple days ago the Nam went hard on an appetizer (1-3") just to the south of the Metros at the end of its run for Friday, and that's Poof!
Can't expect the Nam to get all thermals correct at the far reaches of its forecast period. And it's the far reaches where thermals become an important factor in final snow totals.
In the overall pattern, they have been in the long range. But I don't know if that applies in the short range....probably not, since each storm is different with its unique conditions.