Apocalyptic time-lapse video of massive Phoenix dust storm

The headline monster strikes again, and the photographer quoted above is obviously not an expert. These things are fairly common and short-lived. There was one in Kansas when I lived there less that 20 years ago, though I don't remember the exact year. They look really cool but they are fairly harmless. The Phoenix area has had these things many times before. It's fairly easy to look it up on Google.

Nice footage, but I'm especially fascinated by what's apparently going on in the cloud line immediately above the dust wall. I'd love to hear what the data concerning that was like, if such data was collected... stuff like aerosol density over time/distance, changes in the electrical fields, wind vectors, that sort of thing.

From an amateur's point of view, I can't immediately tell which direction cause/effect is running, or even if it is - in other words the advancing "frontal" effects above and below may have the same (other) cause, and not be a case of one causing the other. I wish I knew.

Anyways, thanks for the video - it certainly hit my curiosity switch.