|Strong easterly winds (photo taking looking north) this morning in the Avenues foothills|
There is also clear evidence of a rotor near the Salt Lake City International Airport. Note how the easterlies extend to downtown, but the flow at the airport is westerly, as depicted below.
|Source: Whiteman (2000)|
The cause of these downslope winds is easterly to southeasterly 700-mb (10,000 ft) flow being driven by a closed low off the coast of California and an elongated upper level ridge extending northwestward from Texas to the Pac NW.
Peak gusts so far include 47 mph on the Bountiful Bench, 45 mph in Farmington, and 43 mph at the University of Utah. These winds should slacken in the next few hours.