"Haboob" is an Arabic word for a dust/sand/windstorm, usually caused by the collapse of a thunderstorm cell. The plunging air hits the ground and roils outward, picking up debris across the open desert. This is video of a 1,000 foot haboob rolling across Phoenix, Arizona.
Click here for an article by William DeBuys at grist.org (an environmental blog worth a click) entitled "The Least Sustainable City: Phoenix as a harbinger for our hot future."
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