Cc stratiformis

Taken late morning of 29May18. Formation of cirrocumulus clouds following the passage of dissipating spotty mid-level thunderstorms in the vicinity from altocumulus castellanus clouds followed by the perlucidus variety with the cloud elements continuing to become thinner. The visible satellite image on the third thumbnail depicts this and observing the evolution of the satellite images, it was clear that the clouds were dissipating as the day passed by. If the described evolution is correct then the genus ‘altocumulomutatus’ have to be added to the photographed cloud becoming “Cirrocumulus stratiformis lacunosus altocumulomutatus”. It is stratiformis because the cloud is developed in a widespread layer also confirmed by the second thumbnail photo indicating the whole cloud system and lacunosus because of the rather evenly distributed round frayed holes having very frindged edges similar to small grains and ripples and without shading that distinguishes cirrocumulus clouds. The first thumbnail is a close up view of the described cloud elements taken through professional camera for better analysis. The photographed cloud seems to also show cavum, an unfilled distrail in the cloud cover hinting that the cloud elements were likely distributed by a passing aeroplane. The upper part of the second thumbnail photo also shows clear undulations within the cloud cover. A surface low pressure system over North Africa (fourth thumbnail) that developed due to very strong late spring sunshine initiated convection over the region with the upper-level clouds moving to the northeast towards the Maltese Islands via the upper wind as shown in the Jet Stream chart on the fifth thumbnail. Finally, the weather sounding on the sixth thumbnail indicated plenty of upper-level moisture and instability with promote the formation of cirrocumulus clouds probably consisting of ice crystals as temperature at upper levels was well below -20C with the cloud base being at least 7.5km high.

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