a good recent example of a -PNA/-NAO that worked in the northern MA was in late Jan into mid Feb 2021. the NYC metro into NJ saw a historic blizzard and a few other storms, bringing them to 26" on the month. yes, it wasn't great for you guys, but again, that's a matter of luck IMO. if the confluence associated with that storm was a bit slower or farther S, it would have been you guys getting smoked
this is honestly quite similar to the late Dec pattern this year. again, just goes to show how much of this is really just dependent on luck, especially the farther S you go. as variance increases, the more things need to line up correctly. this pattern could have easily produced a major snowstorm, but the devil was in the details. what can you do?