Ac castellanus

Formation of towering altocumulus clouds caused by the transit of a low pressure system combined with lots of instability from mid-levels of the atmosphere upwards. Their height is mainly due to convective inhibition at the surface inhibiting surface air from rising upwards. The trigger for the formation of these clouds seemed to be a developing cold front over the Maltese Islands as indicated by the third thumbnail. The first thumbnail shows an isolated rain shower falling all the way to the ground from an altocumulus castellanus cloud possibly becoming `Altocumulus Praecipitatio`. The second thumbnail shows the weather sounding over Malta on the day as explained herewith.

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