This site is mostly about the fluid dynamics associated with Prandtl-Glauert condensation clouds but it has links to other sites with some great photos. Just surf the links.
http://fluidmech.net/tutorials/sonic/pr ... clouds.htm
http://www.steehouwer.com/
![Image](http://www.wilk4.com/misc/f18.jpg)
http://www.wilk4.com/misc/soundbreak.htm
![Image](http://chamorrobible.org/images/photos/gpw-20040817l-UnitedStatesNavy-050727-N-3488C-051.jpg)
http://chamorrobible.org/gpw/gpw-20040817-English.htm
Don