Cumulonimbus cloud formation of the species capillatus due to its fibrous structure with a clear anvil shearing off to the east upon reaching the stable layer estimated at 9km above sea level. Some left over cirrus spissatus from other Cbs could be seen on the left hand side of the photo hence the suffix ‘cumulonibogenitus’. This cloud had later produced rain showers but no thunderstorms. The first thumbnail is another photo taken at sunset showing cumuliform cloud bubbles piercing out from stratocumulus clouds in the background as ‘Thermals’ manage to break through a stable layer in the atmosphere. The second thumbnail is a wide panoramic shot of sunset taken at the same time as the first showing the whole cloud on the horizon. These clouds as confirmed by both the visible satellite and surface pressure images on the fourth and fifth thumbnails respectively were all associated with a low pressure system to the north of Libya churning out isolated cumulonimbus clouds towards the Maltese Islands. The weather sounding on the third thumbnail indicated a modestly unstable airmass with a rather steep lapse and ENE currents throughout the whole atmosphere aiding in the photographed cloud formations.