The much anticipated storm cycle is upon us. It is already snowing what appears to be pixie dust up at Alta. Automated observations show 2" of new snow from .03" of water, which would be less than 2% water content if accurate. The latter may be underdone, but it certainly looks light and fluffy on the snow-stake cam and pictures never lie, right?
The models are now in pretty good agreement on the general characteristics of the storm through 0000 UTC 3 December (5 PM MST Saturday), so I'll start with that period. There will be a crest-level (10,000 ft) trough passage at around 2 PM MST this afternoon and then a second one at 11 PM MST tonight. I've identified each of these in the HRRR-derived guidance for Little Cottonwood Canyon below. Then there's a third trough passage at around 5 PM MST Saturday, and this is where we start to see a good deal of model divergence.