Biggest threat for sure is likely Hydro. That's gonna slam a lot of dry areas and especially the high terrain with a ton of moisture. You want to end the drought.....you got it brotha.
You can see how synoptics came into play on that map. You likely had perhaps a PRE like feature and/or a warm front in SNE stalled with tremendous isentropic lift has the storm approached.
But look how widespread those totals are. So many rivers would be in major flood along with basements etc. It's not just a flash flood affecting 20 ppl in Conway, MA.