For most of the day today, it has been snowing in an area confined to the region immediately downstream of the Wasatch from about Provo Canyon to Big Cottonwood Canyon. Radar echos do not begin over the initial westward slope of the Wasatch, but somewhat downstream. This is evident in the radar image below and also longer loops covering the afternoon (loops not shown).
Visually, this is what it looks like from the Avenues. There is an incredible, shallow, cumuliform cloud banked up over Lone Peak. This is the so-called Lone Peak cap cloud that appears frequently in southwesterly flow, but isn't always associated with heavy snowfall.
Note that it is not snowing at all at the mouth of Little Cottonwood Canyon, Big Cottonwood Canyon, or along the base of the Wasatch Mountains. Based on the radar, it has also snowed little in Mill Creek Canyon.
Within the shallow orographic cloud, it has been snowing all day. Precipitation began to become localized and the Lone Peak cap cloud emerged from the broader cloud deck at around 8 am this morning. Since then it has snowed about 6 inches at the Alta-Collins snow stake, with about .24 inches of water. That's cold smoke at 4% water content and reports are that the skiing today was fantastic.
All in all, this is a remarkable storm. The dynamics of the event, especially the shallow convective dynamics, microphysical processes, and local forcing, are worthy of further investigation.