Ah, I know I'm bumping this one up a bit, but I recently saw some movie footage from what I believe is the same sand storm. It's pretty crazy, this guy is filming the whole thing from inside the camp, when the sand hits, things slowly get darker, and darker, and darker until it's pretty much pitch black whith only light comign from a lamp by one of the buildings. It's amazing how fast the visability decreses, even without the darkness. It's really not like in the movies where all you need to worry is getting a bit of sand in your eyes.