WESTERN S.D. AND NORTHEASTERN W.Y. As we go through today, we’ll see on-and-off light snowfall across western SD and parts of northeastern WY, with heavier snow likely in the northern Black Hills and portions of the northern foothills. Snowfall totals of 3-6” are expected for the northern Hills, with localized amounts up to 9” possible. Temperatures cool again Friday, with teens and 20s for much of western SD, while northeastern WY holds onto 30s and 40s.