Yeah it's real even in the weaker/lighter solutions. Of course there's a larger scale deep layer easterly flow and mid-level lift spreading precip way west, but that's like E MA version of meso-scale precipitation genesis... almost like orographics. But the lift is from speed convergence of the flow coming ashore not terrain, and some ever so subtle veering of the flow from ESE to ENE under 850mb helping the lowest levels. It's just going to pile up air into E MA.
That type of strong low level lift also should result in an area of sinking/subsidence air nearby... almost like a standing wave pattern for a time. Very similar to upslope when you get waves of lift/sink develop. Of course any mid-level deform banding can overcome that lower stuff too. Need to watch for some more acute minimums that may not be traditional. I'm very high confidence at this point in E. MA QPF max... even glancing blow and weaker, you will get that stronger lift there relative to elsewhere. The mechanism for convergence is pretty strong, sustained cross barrier flow with the shoreline.