A dust storm snarled freeway traffic south of Phoenix for more than an hour before conditions cleared for drivers.
The storm from the season's first monsoon dropped visibility to less than a mile at one point late Thursday afternoon.
Arizona Department of Transportation officials said State Route 347 near Maricopa about 15 miles southwest of Casa Grande was closed until the dust stormed cleared, as was a section of Interstate 10 from Casa Grande to Picacho and State Route 79 south of U.S. 60.
The National Weather Service says the storm was produced by thunderstorms that developed in eastern Arizona and dropped less than an inch of rain in Globe.
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