A monsoon storm swept through Phoenix, Arizona, on Monday, July 30, downing power lines.About 100,000 customers were left without power due to the storm, AZCentral.com reported.In a tweet, the National Weather Service in Phoenix warned there was a dust storm warning in effect until 9.30pm.This video shows the monsoon winds and dust storm in North Phoenix. Credit: @_dan_i_ via Storyful