|The thin thin layer of smog over the Salt Lake Valley as seen looking south from the upper Avenues on Tuesday, December 31, 2013. Courtesy John Regehr.|
|The thin layer of smog over the Salt Lake Valley as seen looking northwest from Ferguson Canyon. Note how the buildings in Downtown Salt Lake stick up above the smog. Courtesy Dave Kikkert.|
|Pollution extending from Utah County into Provo Canyon and environs as seen looking south from the top of Snowbird.|
|Pollution pushing up Little Cottonwood Canyon eventually reached the base of Snowbird.|
Why we were able to vent and mix more effectively yesterday afternoon is a bit of a mystery, but the inversion did weaken as cooler air moved in aloft on Tuesday and then temperatures yesterday did climb to their highest levels in many days.
|Source: Utah Division of Air Quality|
Anticipating these partial mixouts is perhaps the most challenging aspect of the meteorology of inversion events. I don't think it was well anticipated by anyone, including yours truly. As much as that bothers me, I'm not going to complain as this is welcome relief. A series of systems on Friday and Saturday will hopefully bust up the rest of the gunk.