What I take away from that map is more of an east coast problem than just somewhere in the Carolina’s and it all stems back from the insane lack of coastal storms that have worked. To me, this is where climate shifts have caught up with snowfall. Our biggest snows have always been and will always be from coastal lows. Recently, every coastal system has either missed, or the BL has been too warm for snows. These are always borderline systems where the heaviest snows fall in 31-33 degree temps so a swing of 1-2 degrees will absolutely destroy what otherwise was a perfect track system. You’ve seen this up and down the coast and unfortunately this might be more common in the future. The snows we have gotten including the two all snow events last year were in deep cold air masses with coastal lows either too weak or too far offshore to produce enough QPF for heavier amounts. I know eastern N.C. got lucky and it can still happen, but it just seems like it takes more than it used to to get coastal lows to produce snowfall in the piedmont and up the east coast. I remember the I-85 snow line when that was a thing and the rain snow line wasn’t somewhere in Virginia. We used to have 1-2 of these a year at least where Raleigh would have some kind of mix to rain and places west of here got plastered. Recently it’s been all rain or just a brief roxboro mix to rain. That’s what I see the most out of that map and it gives me a lot of concern for the future as our main form of bigger snowfall seems to be taken away by background warming