Never mind all the talk about dropping pressure and bombogenesis and stuff: The mark of a true nor'easter in Boston is when a boat washes up on Carson Beach (added points if it then stays there for weeks on end). Roving UHub photographer Jim Gavaghan provides all the evidence we need that that was some blow overnight: Not one, but two boats washed up on the beach.
Another roving UHub photographer, who prefers to remain anonymous, shows us the back side of the blue and white boat (we're going to assume it was moored off the beach and was not actually blown there all the way from Salem, but who knows?):
2012. 2017 (OK, Castle Island). 2018.