For the past couple of hours, there has been a persistent train of echos extending along the southwesterly flow from southern Utah County across Mount Timpanogos, the upper Cottonwoods, and the Park City ridge line.
At times, things looked quite sinister from the Salt Lake Valley, with some mammatus for a brief period of time (photo below a bit fuzzy, sorry...).
Alta is getting quite a thumping, with .29" of water equivalent recorded from 1-4 PM, including .21" in the past hour, with 2" of snow (ignore the snow depth in the data table below).
Addendum @ 455 PM
Altitude is everything. During the period above, Alta gets the goods, downtown Park City the drips.