|Dust partially obscures the view of the Wasatch Mountains from the Avenues Foothills at 2:50 PM.|
A MODIS image taken earlier today shows that the most likely source of this dust for the Salt Lake Valley is the Sevier Lake Bed, plus a couple of point sources just to the east in the Sevier Desert.
During my hike from about 2 to 3 PM, a cold front pushed into the Salt Lake Valley. Note the shift in surface winds from southerly to northwesterly in both the Tooele and Salt Lake Valleys below.
By the time I got home, the central Wasatch south of Mount Olympus were completely obscured. One often sees high dust concentrations along cold fronts and troughs due to the convergent flow.