Here, we see two low pressure systems- a cutoff low in the Southwest as well as another system moving onshore Canada. As of right now, they appear to be 2 separate storm systems.
Hour 216 of 12z ECMWF
At hour 216, we are seeing the same two low pressure systems moving eastward. It looks like the cutoff low may be getting some energy from the Gulf, and I could see a snowstorm hitting Missouri and states to the west of Missouri. The other disturbance in Canada continues to move east.
Hour 240 of 12z ECMWF
At hour 240, we are seeing some major phasing occur in the Western Great Lakes, which may indicate a major winter storm could hit the far Northern Midwest areas into Canada.