RAP is interesting. It has two areas. Basically a fronto area extending into SNH from central MA, and then the meso low convergence. Reminds me a bit of those "injection lows" that we have said in the past. An injection of higher theta-e air from low levels up and over the colder air. That looks to blitz here verbatim, but lower levels a little more challenging. It's close though, but I could see those two areas of lift to watch.
In any case, it's not surprising that guidance is a little all over with QPF from these.