Formation of glass-like altocumulus clouds a few hours before the formation of stratocumulus clouds with precipitation as per first thumbnail and 12 hours before an overnight thunderstorm in the area though such co-incidences might be unrelated. These clouds are very easy to identify as similar to glass they allow light to pass through and even the blueness of the sky is visible through them. They are transparent because these clouds may have just formed over the area before thickening. The cause of this cloud formation and stratocumulus praecipitatio on the first thumbnail was due to an upper-level cold pool as indicated in the third and fourth thumbnails directly overhead Malta. The weather sounding on the second thumbnail show the potential of both cloud formations though these clouds could not connect due to a layer of dry air between the two cloud levels limiting upward motion for a time.