If the models make a small mistake with the low-level temps, this snow north of OKC turns to ice or rain. The low-level profile here from the GFS is good for heavy snow, it's just so close to 0*C up to 700mb. The 500mb heights are so high, that the 1000-500mb critical thickness line is in Kansas, about 10 miles north of Wichita. We have a long time before this is a short-range forecast, so the models will obviously take some time to resolve the exact rain/snow line (or freezing rain/sleet profile, if that exists.)