They are caused from the down drafts from thunderstorms over the deserts. When the draft hits the dry desert floor it picks the dirt up and it begins to roll, picking up more as it travels.
I haven't read all the comments, but where were you when it came? And where did you stay when it was there? And how long did it take from start to finish? P
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Hope everything is ok.
Excellent series of this event of nature.
Congratulations on your VIP & AC.
~Jeff
I wouldn't want to be caught outside during one of these. YUCK!!
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