We've already had a peak gust to 74 miles per hour in Centerville and 69 miles per hour at the University of Utah.
As is often the case in downslope windstorm events, the strong winds are confined to very near the Wasatch Mountains. Note how light the winds are at the KSLC airport and that there is a northwest wind at Hill Field. This is evidence of a hydraulic jump and rotor. The hydraulic jump is where the flow transitions rapidly from horizontal to vertical and there is a pronounced wave with a wave downstream. Within that wave, the flow can actually reverse, forming a rotor, which sometimes contains sub-rotors, embedded vorticies with strong turbulence.
|Hydraulic jump and rotor (Doyle and Durran 2007)|