Not sure you looked at radar, but it was shredded by 5-6am. Temps near and below 32. And yet those borderline areas still had 3". It had nothing to do with ratios etc. Nobody expected fluff. But a prolonged event of 0.3"to 0.5" QPF was expected before a flip. The main action stayed closer to the LLJ near the south coast which does happen. Temps were not the issue. Hell I wetbulbed to near 32F from being 38F on the coast south of Boston with snow and sleet. If temps and lift were the issue, we wouldn't have had more snow to the south of the areas progged to get several inches.