Reminds me of twirls i sometimes have seen in hot regions looking like the
following:

http://members.tripod.de/mbook/travel/california2000/cal2k-imgs/images/Dcp_1152.jpg

http://home.t-online.de/home/cpuri/images/windhose.jpg

Usually they are some meters high and only exist for a few minutes, but
they can also be much larger and become quite dangerous when moving near a
road where you are driving with a car.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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