Been thinking on this today. Recently moved from 20 yrs in SWMI and over there, the magic number has a lot to do with whether you are in a LES region or further inland. Even at that, Battle Creek and a bit west into Kzoo county had 28-30" during that January 1967 storm, and that was not lake effect enhanced as winds were contrary. Then there's Jan of '78 where the winds were favorable for the lake to contribute and thus some 36" totals were seen. There was even a small region south of Jackson that scored 34" in the '78 monster, and nowhere near a great lake. Marshall had 22" in both of the Jan 26-27 biggies, so for them a 2-footer is "next level" but I feel a solid 30" storm, lake enhanced or not, is looming out there somewhere over the horizon. Just so tough to beat '78 where the lake added significantly to hardest hit regions.
Now for SEMI, they already hit the 24" mark way back when but I struggle with thinking that might repeat let alone something on the 30" magnitude. The Tri-cities region will get help off of Huron and Saginaw Bay with a strong NE fetch and there is historical news accounts that 30" fell during the 1857 blizzard. This I remember when reading in old newspaper accounts about the '67 bliz.