Dennis M. Rodgers wrote:
The topic has diverged from anything meteorological. Please
drop sci.geo.meteorology from the list. Thank you.

Grant suggested that ice meteors be in the crop circle category of fakes.

But are they fakes, for if they aren't all then that argument may have to
be ruled out.

No-one has commented on polar stratospheric cloud. Grant pointed out how
thin the atmosphere is there. They occur in the winter. Maybe conditions
are sufficient to make clouds of water from cometary fragments. Can any
large fragments get through?

We touched on vortices. Vortex theory was advanced by Kelvin and Thomson,
but superceded by the particle theory, though particles were found to have
spin. Maybe spin can have a laser effect. Sorry about the dreaming. The
simple wind vortices would seem to produce too irregular a form to be
recognised as a crop circle.

Is there any theory of how smoke rings can bounce off one another, and can
that happen with any atmospheric clouds?