It's typical of the Phoenix area to get rain in the summer. They're thunderstorms, and they're usually called "Monsoons".
As an old desert rat, I love the thunderstorms. I shot a video this morning, just as it was beginning, but it really doesn't do it justice. You have to feel it, and smell it, to understand. If you live in the Phoenix area, you know.
Brad draws custom cartoon illustrations for publications, blogs, presentations, anything you want. You can contact him at his website BradHallArt.com