We are finally getting a chance to look at some of the data we collected during Sunday's storm. We haven't had a chance to georeference it, so I need to hand wave a bit in this discussion.
On Sunday, we were taking vertical slices up Little Cottonwood Canyon from our observing site near Daybreak. An approximate position of one of these vertical slices is shown below. It is oriented up the canyon and crosses over Snowbird and Alta. Keep in mind that the radar beam spreads with distance from the radar, so the beam is actually somewhat wider than indicated by the red line.
Below is the radar reflectivity from this slice. Warm colors indicate higher radar reflectivities that likely indicate greater concentrations or sizes of ice paticles and snowflakes. The bright red stuff near the bottom is ground clutter. I've indicated where I believe we are getting returns produced by the Baldy Shoulder (separates Alta from Snowbird), High Greeley (the ridge between Collins and Suguarloaf at Alta), and the Mount Wolverine/Patsy Marley ridge to the east of Albion Basin.
Note how the radar reflectivities increase and deepen over the Wasatch Range, an indication of mountain enhancement of precipitation. You might also notice that that the storm shallows before it crosses Mount Wolverine. In fact, it's greatest depth is actually upstream of Snowbird and Alta, which may be related to ice-crystal fallout or perhaps the mountain wave induced by the Wasatch Range tilting upstream with height. It will be interesting to see if our computer models can replicate this structure as it is likely important for limiting how much snow falls out as one moves eastward across the Wasatch crest.
The lack of returns at low levels east of the Baldy Shoulder occur only because the beam is fully blocked by the terrain. We know from the Collins data that it was dumping fairly hard at this time at Alta. Bummer that the radar can't see through the terrain!