The models call for a strong cold front to barrel through northern Utah tonight and then stall over central Utah. Most of the lowland precipitation will fall as rain ahead of the front later today and early this evening (with some mountain snow, especially in the northern Wasatch), but then change over to snow following frontal passage. Steel yourself for a challenging commute tomorrow morning.
What happens thereafter depends largely on where the front stalls. After bringing the cold frontal precipitation band through the Salt Lake Valley tonight and early tomorrow morning, the GFS puts the band of heaviest precipitation just to the south of Salt Lake City tomorrow.
Thus, if Mother Nature follows the GFS, this will be a major storm for Utah County and environs to the south and the west, with lesser accumulations as one moves northward into the northern Salt Lake Valley and the Wasatch Front north of Salt Lake City. Much will depend, however, on when and where the front stalls, so stay tuned to the weather forecasts at http://www.wrh.noaa.gov/slc/. The forecast below was issued this morning at 10:19 am.