In article ,
ess says...
Some time back I saw a magazine article about something mysterious
called "pan turbulence" that bit airliners in clear air, often
somewhere in the middle of the USA.

Could this have been plain old rotor by any chance?

I've not heard of pan, but only of CAT (clear air turbulence), which I
think is often caused by wind shear, particularly near the jet stream.
--
-------
Eric Greenwell USA