Dirty Air from California

From Mike Leuthold this morning:     About 1-2mi vis here this morning in what I initially though was fog but it's dust!  I've never seen it this thick before (outside of a dust storm).  The plume was quite clear on RADAR up by PHX yesterday.  I looked at high res MODIS imagery (along with GOES IR) and traced it back to the deserts of far SE California. [See below - shot of dust with clouds on the Catalinas above the dust.]