Yeah I think that's exactly what's happening, also related to why this storm came further north than it was supposed to a few days ago. The HP seems to have been slower getting into place than originally modeled.
You can see the dry air eating away the returns on the northern side as it's pushing South. The 3k NAM has precip eroding all the way back to 64 at one point this afternoon before the coastal takes over, but I'm choosing to ride the HRRR lol