Liking the general setup for northern Missouri and southern Iowa to see the brunt of this system. However, there's a spoke of energy coming in out of the Dakotas at the same time which needs to be integrated into the whole scenario... That's inducing a bit of uncertainty on the northern edge of this system (Northern, NW Iowa, So. Minn., et al)
I see some signals to distinct bands of snow to produce decent marks but also see potential for the southern system to rob moisture so to speak.
The southern low has had fairly consistent marks for the last three days. Pretty high confidence of major snow impact either side of the MO/IA border.
It's that northern energy that leaves things more uncertain north of I80 as far as amounts. I'd still plan on snow in these areas up through about US 14, lacking the sharp cutoff gradient too... but just not as much as the southern part of the state too.
At this point, if you are model surfing, you should really be focused in on ensembles rather than one deterministic run. Right now they're still struggling on how to bring this northern wave into the equation.