I am trying to find the largest tube in Fort Collins, Colorado.
Is it possible to have a tube with non-solid sides (fluid sides).
Is there an atmospheric condition that could cause the formation of a tube?
By a tube I assume you mean something which has well-defined
sides and an "empty" or at least "different" middle? I am not
aware of anything that a fluid could make that resembles such
a thing. However, there are two fluid phenomena that you might
be able to argue as tubes - a vortex and a convection cell.
The vortex is what you get with a hurricane or (smaller) a
tornado. The convection cell is much larger and involves the rising and
falling of huge sections of the atmosphere - I think there are three or
four convection cell regions in the atmosphere stretching from
the equator to the poles. Maybe an atmospheric scientist can give
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Update: June 2012