Cb altocumulogenitus

The photographed cloud is being classified as cumulonimbus altocumulogenitus due to its seemingly large vertical extent consisting of a cirriform upper section and high-based cumuliform parts in its lowest section. In fact, the weather sounding on the third thumbnail was indicating high based clouds above the 6km altitude, at which height the cloud would still be composed of super-cooled water droplets. Just below its anvil, scattered altocumulus clouds were observed. This analysis is corroborated by the rainfall map on the fourth thumbnail which indicated a group of decaying thunderstorms moving southeastwards offshore across the west side of the Islands at the same place where this cloud was observed. The visible satellite image on the fifth thumbnail showed the clouds initial development along a trough line offshore the east of Tunisia as depicted by the sixth thumbnail SLP chart which then later dissipated under the presence of an upper-level ridge. Some virga or evaporating precipitation could be dimly observed at the cloud base. Some large rain drops were reported in Gozo through social media. The first thumbnail shows a distinct high-level cumulus congestus clouds with clear drop stirs at its bottom and casting a shadow or anti-crepuscular rays onto the altocumulus cloud above it having mammatus features. This indicated a descending airmass perhaps a sign of the bad weather system dissipation. The second thumbnail shows the initial arrival in the early afternoon or rather the spreading out of the system as the anvils expanded towards Malta. MAX Temp still managed to reach 34°C under a hot morning sun which was well above average for the day.

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