The solution he was forecasting is likely not even close to being correct...
That would be the 18z GFS series, which develops a surface low pressure over the Carolinas and takes the impulse straight north into the QC Eastern Townships, then into the Laurentian Shield.
As you can tell by the packed isobar configuration on all of the mapped depictions, high winds and piercing chill factors are a given in association with this storm. The freezing air at one point may reach central Mexico. But rain and snow boundaries, and intensities, are not as easy to outline. Because of the lack of surety in the trajectory, even parts of the Mid-Atlantic and New England could see substantial snow. Accumulations of snowfall, along with icing, could reach farther south due to the broad upper low and mesoscale impulses rotating around the core. The 954MB pressure forecast on Saturday morning in QC is probably correct; this system has the word "bombogenesis" written all over it!