Not really that unusual. Actually not that uncommon every couple of years or so. Very fast easterly flow at 850 mb is conducive to lots of lift in the atmosphere
Tandy Andy gave me this snow band probability link
https://www.wpc.ncep.noaa.gov/snowbands/dmodel.php?cycle=2021013112&model=HREFv2&domain=NE&field=snowobj_byhour&thresh=0.1&fhr=01
NAM and HRRR EPS lock step. Intriguing that the usually amped NAM has been super consistent. I find these modeling differences so interesting from a Met perspective.