Watch: Moment massive dust storm surges through Arizona
A massive dust storm has swept through parts of the US state of Arizona. The thick wall of dark dust in Pinal County was carried by thunderstorm winds - a phenomenon known as a haboob, according to the National Weather Service.
The term haboob comes from Arabic and refers to a 'strong wind' or 'gale.' In the United States, they are most common in the southwest.