The main photo and the first thumbnail most likely show thick cirrus clouds of the species ‘spissatus’ and of the variety ‘radiatus’ because these clouds definitely look converging towards a point in the horizon. The second thumbnail definitely confirms that the clouds are high-level. However, one might also classify the clouds as upper-level altocumulus undulatus radiatus. The third thumbnail is the weather sounding which definitely confirms the right weather conditions for such clouds to form having a very moist and deep upper-level airmass at altitudes between 8200 metres and 12200 to form a 4km thick high cloud, wind shear and very strong Force 11 SW winds at the Cirrus level, perfect ingredients for the photographed cloud formation. The fourth thumbnail shows a strong jet stream over the Maltese Islands favouring such cloud scenery and the fifth thumbnail shows upper-level trough very close to the Maltese Islands which brought nearby thunderstorms producing lots of mid-level and cirri outflows.

Further explanation of the weather situation could be found here.