THought this was appropriate to post in here...HABOOB!!! LOOK!!
LOL!
Sand walls thousands of feet high occur in the deserts of the Middle East, the Sahara and Arizona.
A haboob is a wall of dust that can stand hundreds or even thousands of feet high. It is the result of high winds that blow down and agitate sand and dust, which causes the debris to blow up into a tall stacked wall. An average time span of a haboob generally ranges from 10 to 30 minutes.
Haboobs typically occur in dry areas, particularly the Middle East, the Sahara, North Africa and the US state of Arizona, where there are large amounts of sand and high temperatures. These dust walls can be dangerous if they are tall enough to cause issues with visibility, particularly if it affects ground and air transportation.
http://www.wisegeek.com/what-is-a-haboob.htm?m
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