You might be interested to also try out the following cloud surface 
media (replace with the one in the scene):

#local Scale = 5;

cylinder {
   < 0.0, 0.0, 0.0 > < 0.0, 0.45, 0.0 > 10.0
   pigment {rgbt 1}
   hollow
   interior {
     media {
       samples 20
       emission <1.0, 1.0, 1.0>*0.1
       absorption <1.0, 1.0, 1.0>*1
       scattering {1, <1, 1, 1>*1/Scale extinction 1.0 }
       density {
         ripples   // controls the cloud formation
         frequency 3
         color_map {
           [0.5 rgb 0.02]
           [0.5 rgb 1.00]
         }
         scale <3, 1, 10>*1
         warp {turbulence <2.5, 1.0, 1.6>}
       }
     }
   }
   scale Scale
   translate <0, 1, 0>
}


-- 
Thomas

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