Ci spissatus

Formation of dense cirrus clouds taken through panorama settings, noticeable with its grey base obscuring the sun. The high-level cloud has also fibratus elements at the edge. This cloud development was related with an upper-level trough approaching the Islands from North Africa as can be seen in the third thumbnail. The first thumbnail is a photo taken of the clouds in the right-hand side of the panorama photo. The first thumbnail photo is depicting totally different clouds probably being cirrocumulus virga as these clouds looked like being at similar altitudes. Although the weather sounding on the second thumbnail indicated no instability, the upper-level chart showed lots of positive vorticity over the Maltese Islands and hence rising air motions forming that cloud. The fourth thumbnail is the visible satellite image showing clouds over North Africa although no lightning strikes were observed in that morning when the photo was taken hence could not confirm that the photographed cloud formation was the result of decaying cumulonimbus clouds. The following day, the weather over the Maltese Islands was characterized by nimbostratus clouds with moderate rainfall and strong winds. Note: From this photo onwards, the WMO Cloud Atlas launched in March 2017 will be relied on to provide future cloud descriptions.

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