Cirrus uncinus clouds identifiable by their tufts ending of the cloud. Cirrus spissatus and cumulus clouds were approaching the area. However, the most spectecular thing was the quick growth of the cumulus to become cumulus congestus praecipitatio as shown in the first thumbnail. The weather situation that caused such cloud formations was a very small area of low pressure as indicated by the surface pressure chart on the fourth thumbnail causing local cloud formations. It was fuelled by a closed cold pool of air and confirmed by the visible satellite image on the fifth thumbnail. The weather sounding on the third thumbnail indicated a moist air profile along with steep lapse rates at the lowest levels allowing cumuliform clouds to quickly build up. The persistence of such weather was unusual for a Maltese Summer.