Check out the dust devils on Mars. Some estimated to be 30 km high!

http://mars.jpl.nasa.gov/gallery/duststorms/

JD

Roger Worden wrote:
However, if one is not near the ground, dust devils can be quite useful. On
Saturday I spotted a big one like in the first part of the video. The "dust"
part only went up about 300' AGL but the rest of it took me in a Grob 103
from 3000' up to 9000' MSL. Nice!

"Stewart Kissel" wrote in
message ...
Why one keeps the canopy closed and the wings tied
down in the afternoon.


http://www.youtube.com/watch?v=bCGUE...arch=parapente