The National Weather Service has issued a dust storm warning for Maricopa County until 8:15 p.m. on July 25.
The dust wall stretched from near Estrella Sailport to near Freeman, six miles southwest of Bighorn, and was moving southeast at 35 mph.
Hazards include visibility less than a quarter mile with wind gusts exceeding 40 mph, creating dangerous and life-threatening travel.
This includes the following highways: Interstate 8 between mile markers 128 and 171, State Route 238 between mile markers 28 and 44, and State Route 347 between mile markers 161 and 178.
Affected areas include Casa Grande, Maricopa, Freeman, Bighorn, Estrella Sailport, Stanfield, Ak-Chin Village and Mobile.