Matt Drudge is always good for a headline and this one is accurate. However, the video at the Drudge Report calls it the “Doomsday” cloud. This happens in Phoenix every so often and it is common enough that there is a word for it. It is called a haboob. And, if you click on the link, you’ll see lots of similar images. In this case it was due to a complex of thunderstorms generating a huge “gust front” that picked up lots of dust and sand.
UPDATE: 10:37am, here is an excellent time-lapse of the haboob: