A giant dust storm covers Phoenix, Ariz., Tuesday, July 5, 2011
Mary Nichols and JoAnn Buckson, right, run for cover in Phoenix Tuesday July 5, 2011 as a dust storm blows through. A massive dust storm has swept into the Phoenix area and drastically reduced visibility across much of the valley
People walk in downtown Phoenix during a dust storm Tuesday, July 5, 2011. A massive dust storm has swept into the Phoenix area and drastically reduced visibility across much of the valley.
A dust storm known as a "habub" rolls into downtown Phoenix on Tuesday night, July 5, 2011, bringing strong winds and low visibility. Habubs are part of Arizona's annual monsoon season, which is now in full swing
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