With yesterday's strong south winds, dust moved into Salt Lake Valley and environs yesterday and lingers this morning with visibility somewhat reduced as one looks to the central Wasatch from the University of Utah.
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| Source: https://home.chpc.utah.edu/~u0790486/wxinfo/cgi-bin/uunet_camera_explorer.cgi |
Observations from the University of Utah show strong south winds yesterday afternoon and evening with PM2.5 levels increasing after about 1600 MDT from 3 to 8 ug/m3. After settling some through 0200 MDT, they then climbed again to 13 before settling some this morning.
These numbers are not high and are at good to low-moderate air quality levels, but nevertheless, there's plenty of dust in the air.
Give the overall flow yesterday, the dust in the Salt Lake Valley was likely from sources to the south and the southwest given the flow direction and not from the exposed Great Salt Lake bed. The flow direction was such that if there was dust emitted from the Great Salt Lake bed, especially Farmington Bay, it would have been transported to the northern Wasatch Front. I'm not sure if there could be a some dust from the lake bed mixed in now given the shift to northwest flow last night but I suspect most of this is still from origins to the south and southwest.
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