http://www.foxnews.com/weather/2011/07/06/massive-dust-storm-descends-on-phoenix-area/
A massive dust storm descended on the Phoenix area on Tuesday night, drastically reducing visibility and delaying flights as strong winds toppled trees and caused power outages for thousands of residents in the valley.
First video is a cool time lapse as the storm enters the Phoenix area and the second is filmed by two guys driving into the storm.