While driving back from Panji to Goa we observed three peculiar cloud formations stacked one above the other.The sky was clear and the visibility was excellent.It was almost broad day light.I am now fortyseven years old and I have never seen anything like it until now .I was accompanied by my two children and wife.They were surprised as well.I am a doctor by profession and I believe have an analytical mind.I watched it carefully and found the three formations were not near any of the clouds in the sky and these formations were very much unlike cloud- formations and they were spinning very slowly around a vertcal axis. about 5 to 7 thousand feet above the sea level.They looked like huge saucer shape and each of them identical with a turret at the bottom of each shape.The out line of the shapes remained sharp and did not change for a period of 10 minutes and we had to leave the place since we had some important work to do.Another very interesting thing was that there was intermittent discharge of lightning passing from one shape to another,although it was absolutely a clear day,no storm or rain was percievable.