The best I can get at this stage (no good) using a differenced sphere 
for the shock wave. Diffractions looks ok at the border but I cannot get 
the transparency of the sphere right. The cloud layer is also 
differenced (a tiny bit larger sphere) to ensure that no clouds are 
present inside the shock wave.

Code snippet:

difference {
sphere {0, 1
   hollow
   texture {pigment {rgbt <1,1,1,1>} }
   interior {
	  ior 1.1
     media {
       intervals 1
       samples 10, 1000
       scattering {1, 0.000025
         extinction 1
       }
     }
   }
}
sphere {0, 0.98
   hollow
   texture {pigment {rgbt <1,1,1,1>} }
   interior {
	  ior 1.0
	}
}
   scale MediaScale * 1.52
   translate <CamLoc.x, CamLoc.y, 5000> + <2800, 0, 0>
}


Thomas

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