Great shots, nasty stuff. We get dust storms in Australia, quite regularly, but mostly out west. A couple of years ago we had a particularly bad one which covered the entire south of the country from (I think) somewhere around Adelaide all the way to the east coast.
Wear nose and mouth covering when in this kind of stuff. eeek.
WOW! I grew up in Tucson and never saw ANYthing like that! We had dust devils (like tiny tornados of dust, but you could stand in the middle of one and nothing would happen to you other than dust in your eyes) all the time and an occasional dust storm, but nothing that even came close to that monster. Glad you're ok - that would scare the crap out of me!