nubbsgalore:

video of a pheonix haboob. a haboob describes a weather event in which a collapsing thunderstorm exhales a burst of wind. this burst of wind, or outflow, collects dust in the surrounding arid environment, which can grow into a towering dark cloud that sweeps across the landscape. 

haboobs are common in the desert southwest and the middle east, where the term originated. (habb is arabic for wind). they are very localized phenomena, as opposed to dust and sand storms, which tend to cover more territory. of note, the plural of haboob is haboobies. (video)