I was in Tempe last night, and there were a few intermittent power outages during the actual storm, the dust hung in the air for over an hour. Ive never seen so many dirty cars in this town at one time.
I've been in a few zero visibility dust storms in NM, between Albuquerque and Gallup, but they usually are pretty short in duration, and nowhere near as large.. This was definitely something new for me after 11 years in the desert.