Phoenix dust storm

This time-lapse video, constructed from images taken on a hill at Sun Ray park in Ahwatukee, Phoenix, shows a huge dust storm, known as a 'haboob', descending on the city on the evening of 5 July 2011.

The storm, which was estimated to be more than 100 miles wide, halted flights, knocked out power to nearly 10,000 people and fouled up thousands of swimming pools.