The slow-moving cloud — known as a haboob — hit parts of Phoenix and Arizona City, 60 miles to the southeast, late Monday afternoon, at one point leaving 15,000 energy customers in the dark. The number still without power Tuesday morning was more than 5,000 according to Poweroutage.us, mostly in Maricopa County.

A time-lapse captured a major dust storm over Phoenix, Arizona, that grounded flights Tuesday.