Yeah that WWA is for the ice potential otherwise there would be nothing issued for just 2-4". Though that said, if it was 100% snow and no ice there probably would be more than 2-4" as some of the models are showing.
Definitely seems to be a weakening trend in the models the past 24-36 hours. Snowfall projections upstream near and east of Chicago across MI have really dropped off as the energy gets sheared out coming across the upper midwest. That would seem to play favorably for W and N NY snowfall chances.
Lol yeah... National Blend of Models. I had to Google to see what it was. I've seen the NWS discussions citing it quite a bit the past few years. Apparently it's a melting pot of all the various operational and ensembles but I'm not sure what the weighting system is. The latest version 4.0 from October 2020 now includes the Euro and EPS.
https://luckgrib.com/models/nbm_conus/
Euro is locked in. 6z run unchanged from previous runs. Far NNY and possibly some of the Niagara area might get scraped but for the rest of us... Next.