Formation of cirrus spissatus clouds classified as such because of their relative thickness and clearly having grey shadings. What looks very interesting are the cloud bases seeming like scuds and what looks like virga though the WMO cloud atlas does not associate virga with cirrus spissatus clouds but only for the cirrocumulus high-level cloud type. The first thumbnail shows weather sounding showing high-level moisture along with a very dry layer underneath the clouds and a strong jet stream, the second thumbnail shows the jet stream in the Mediterranean blowing high clouds from Africa towards the Maltese Islands.