From 1997 until 2008 i was working on a mine site in north east angola, lunde norte province, i was working in a small town called lucapa, very remote area, town had a dirt runway but very little air traffic in that area. in october 2007 the rainy season was in full swing and every day a huge storm system would form up and we would get a huge downpour usually from mid afternoon onwards. this day i was outside my office waiting for my other workers to finish up inside one of the buildings, i was looking roughly north west at a huge cumulonimbus cloud that had formed and was moving towards lucapa, i expected a downpour as usual within the hour. as i watched the cloud i saw a black circular object approaching the top of the cloud formation, it was moving very slowly and as i wondered what it was i tracked my vision along the line of movement to see if the object would re appear out of the cloud but it did not and i never saw it again. the interesting thing was that within 30 minutes of the object entering the storm cloud the whole cloud system had dissipated completely and we were left with a clear blue sky almost as if this object had absorbed all the energy from the storm cloud and disappeared. although i never told anyone about this sighting i have always wondered what this could have been.