Formation of cumulonimbus with fibrous upper section that developed over SW Malta due to instability. This was nothing when compared to a huge thunderstorm that occurred overnight towards Southern Sicily but basically had the same mechanism being shown in the second thumbnail whereas a cold Mistral wind counteracting a warm airmass coming off the African coast but neither airmass could overcome each other potentially forming a stationary front. In this area, lots of marine thunderstorms were created with the strongest shown in the third thumbnail. The first thumbnail shows a strangely-slanted cumulus cloud probably because of the effects of the photographed cumulonimbus causing increased convective inhibition in the immediate surrounding. The fourth thumbnail is the weather sounding showing the air profile in that evening.