|Source: Utah DAQ|
However, with a trough approaching from the west, southwesterly flow is expected to increase Friday night and Saturday. The NAM forecast for 5 PM Sunday afternoon is calling for 700-mb (10,000 ft) winds of about 50 knots over the Salt Lake Valley.
Thus, while the inversion will hold through Friday, it will very likely be gone by Sunday afternoon. Prior to that, on Saturday, it's tough to say. Right now I'd lean toward a top-down scouring of the cold pool with the benches possibly breaking out for part of the day Saturday, but a shallow cold pool could remain at lower elevations. Time will tell.
Where the inversion does mix out, temperatures will be mild for December. I suspect we could see highs in the 50s at some bench locations Saturday and on the valley floor on Sunday.