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. (AP Photo/Amanda Lee Myers)

Associated Press
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. (AP Photo/Amanda Lee Myers)
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. (AP Photo/Amanda Lee Myers)
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