On Mon, 1 Sep 2008 04:05:14 -0700 (PDT), Weatherlawyer
wrote:

*snip*
The roaring noises of a distant river or road that can on some days be
heard more clearly than on others, tells us that some sort of
inversion channel is in place. The same sort of weather betrays
aircraft noise patterns and other strong noises whatever their source.

We know that it must be being channelled. And we think we understand
how inversions bend and flex the sound waves involved.

It's called ducting.


The question left then is: Does it work up higher in the atmosphere?

No reason why not.


And the make or break one:
How does it get back down into the earth?

May not. The sound may just simply duct between thermal layers and
never reach the ground.

Cheerz!
Roger