its not so much an actual low track or anything of that sorts, these models are trying their best to give us a snapshot of a lot of moving parts at 500mb. in my opinion the moisture is under modeled, still, just due to the shear energy up there.
but, with that said, on the eastern side of the mountains, there is always the risk of the cold not catching up in time without a true low pressure churning off the coast throwing moisture well back inland
if you take a look at the frontogenesis charts, you generally want to be close to all the purple cirlces they show. that's where the best forcing is to allow heavy enough precipitation to dynamically cool the column if you're on the edge (like my yard is).
if you are in an area where the cold is in place, the precipitation field should in theory, look better than modeled at this point. but again, its so touchy in this type of setup and what's mainly causing it is not a storm so much as forcing/frontogenesis