12z GFS Forecasts Crushing November 30th Michigan Snowstorm

The 12z GFS is forecasting a devastating snowstorm for Michigan on November 30. While the image above encompasses 5 days from now, we have investigated and these high totals do come from the November 30th.
The interesting thing is how the NAM does not bring this solution to light. It appears that the models are divided into two camps:

Snowstorm Camp: GFS, ECMWF, JMA, UKMET

No Snowstorm Camp: NAM

(GEM has mostly rain but back-end snow, will not put in category)

I would say that there ought to be a snowstorm, but may not be as severe as some models are projecting.