Just checked the 12z RAOB out of IAD. There appears to be a bit of a warm nose somewhere around 800 mb, but there's a bit of dry air above and below it. I wonder if the dry air would allow precip to cool the column more effectively and maybe offset that. It would have big implications for snow totals, especially down towards the cities if we can really thump for a few hours as SN or even +SN.