The sounding below is from yesterday morning and it shows a deep valley cold pool extending to about 830 mb (1700 m above sea level), capped by a strong inversion.
Yesterday and overnight, we've seen some shallowing of the cold pool and lowering of the inversion, which this morning was based at just below 850 mb (1500 m above sea level).
This has led to much higher temperatures at some bench locations than observed for several days. For example, at our mountain meteorology lab on upper campus, we're now sitting at about 40ºF. Doesn't it feel good?
The air on campus remains polluted and PM2.5 concentrations remain at unhealthy levels (>55 ug/m3 at present), but they are lower than they were at this time yesterday.
And, its rare that I feel a ping of jealousy about BYU, but they have rocketed to 50ºF this afternoon.
Despite these improvements on the benches, a shallow layer of cold, gunky air remains in place on the valley floor and over the Great Salt Lake and Utah Lake. I would not be surprised if we saw that cold airmass push onto campus this afternoon.
I'm a bit unsure how this event will evolve over the next couple of days as some weak systems move through the state. I suspect the cold pool over the Great Salt Lake and lower valley will be very difficult to crack, but I'll be getting up each morning and hoping for a pleasant surprise mix out, at least for the upper benches and hopefully the valley floor, just like you.