Prandtl-Glauert Singularity - "Vapor Cone"

Some of you reading that are probably scratching your heads. Those of you reading this that frequent air shows or are around fighter jets and such, know what I'm talking about. I won't go into the exact details but it pertains to the cloud of vapor that tends to form around aircraft as they approach transonic speeds. Here's an example:

I think this is one of the coolest phenomena one can witness! It's so cool that I've created a new t-shirt design about it!

Vapor Cone Shirts by WHAT_Studio_Art
Custom shirts online at Zazzle