It's Called 'Haboob': 'Howling Winds' Drive Massive Dust Storm Across Phoenix

Washington Post:

A massive dust storm has swept into the Phoenix area and drastically reduced visibility on highways and roads across much of the valley.

The wall of dust moving from the south descended on the valley on Tuesday night and could be seen from downtown Phoenix. Winds brought in the storm that KSAZ-TV reported to be roughly 50 miles wide.

KNXV-TV:

One Phoenix woman just told us she's lived here 50 years, and she's never seen anything like tonight's dust wall.