Cumulus clouds forming in parallel which can probably be attributed to the mistral winds moving eastwards (refer to wind map on first thumbnail) over the Maltese Islands following a slight easterly movement of the low pressure system (2nd thumbnail) over the Central Mediterranean. This might have caused the relatively widespread ascent of the air ahead of it hence forming cumulus clouds in parallel formation as pictured. This can also be indicated in the visible satellite image (3rd thumbnail). However, the surface pressure chart showed no advancing cold front but the clouds looked beningn enough to confirm this. It was noticed that after some time this photo was taken, the prevailing strong NW wind increased further to Force 8 probably confirming the explanation provided herewith.