That photo was taken about 7 am. As things stand now (8:20 AM) I can barely see the base of the Oquirrh Mountains from my office at the University of Utah.
It's a bit too early to get a good look at the smoke in visible satellite imagery, but we can see it very clearly in ceilometer observations. A ceilometer is an instrument that sends out a laser pulse and measures the amount and delay of the signal returned to ascertain cloud base height. Smoke and other particles in the atmosphere, known as aerosols, also scatter some energy back, which is known as backscatter.
The plot below shows a profile of backscatter recorded from a ceilometer at the University of Utah Mountain Meteorology laboratory at Red Butte Canyon. Time increases to the right and is in MDT. Note the arrival of dense smoke denoted by the change in color from green to yellow at around 3 AM MDT. You can also see that the smoke moved over this site first aloft and then near the surface.
|Source: Utah Division of Air Quailty|