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.

Crews are cleaning up downed trees and electricity largely is restored after a powerful dust storm hit the Phoenix area. The storm was what's known as a haboob.

A massive dust storm hit the Phoenix area Monday, causing power outages, knocking down trees and forcing a temporary ground stop at the city's main airport.