Unbelievable dust storm in Phoenix on 8/18/11!

It was the third major dust storm to hit the Phoenix metro area since last month. A storm on July 5 brought a mile-high wall of dust that halted airline flights, knocked out power for 10,000 people and covered everything in its path with a thick sheet of dust. Another dust storm hit July 18 reaching heights of 3,000 to 4,000 feet, delaying flights and cutting off power for more than 2,000 people in the Phoenix metro area.