A layer of dirt coated cars Wednesday after a massive dust storm covered the city of Phoenix overnight.
Winds accompanying the storm were estimated to have blown up to 60 mph, ripping up numerous trees throughout the city and causing hazardous driving conditions.
"This was pretty significant," National Weather Service meteorologist Paul Iniguez told The Associated Press.
"We heard from a lot of people who lived here for a number of storms and this was the worst they'd seen," he added.
The storm knocked out power to about 9,400 Salt River Project electric customers, The Arizona Republic reported.
But it was the dust that caused the largest problem. Radar showed the storm's wall reached as high as 10,000 feet or nearly 2 miles.
Flights in and out of the Phoenix Sky Harbor Airport were postponed.
The National Weather Service in Phoenix said there is a slight chance of thunderstorms for Wednesday evening.
Tuesday's storm was part of Arizona's monsoon season, which typically starts in mid-June and lasts through September.