As isolated as a rain shower could get. A rain shower falling on a small part of the Grand Harbour from a very small cumulus cloud. Such cloud took a very strange appearance as it was small but with enough height to produce the rain. The weather was dominated by an area of instability around the Maltese Islands producing normal cumulus clouds including this one and my opinion is that the cumulus cloud formed the way it did by coincidence rather than special meteorological feautures. The first thumbnail shows that later the cloud seemed to formed some sort of anvil before dissipating completely. The weather sounding indicated that the convective inhibition at the surface could have prevented the cloud from rising further into the unstable air above which could have quickly turned it into a cumulonimbus.