Dust hides the mountains surrounding Tucson

I had forgotten to download some photos from my camera that I had taken on April 9.  A strong windstorm blew through the Tucson area that day and caused a pretty rare event:  Dust completely hid the mountains.

It just looks grey in the background of these photos.  Normally there are mountains there.  (They are still there, just can't see them).

Mother Nature is a magician sometimes.

Photo taken from the east parking lot of the KGUN building.
Dust completely obscures the mountains to the east of Tucson.

Another photo from the KGUN parking lot looking north.
No mountains to be seen.