Apparently, a marginal supercell developed this afternoon near Trieste, Italy within the Day 1 Outlook for 12/10/2013. Radar scan from a nearby station showed some weak rotation in mid level and enhanced reflectivity. The storm formed in weakly unstable and highly sheared environment and was tracking on the edge of an organized convective line moving across the northern Adriatic sea. It brought heavy rain into the coastal areas.
Radar scan from Fossalon site. Source: OSMER FVG
Webcam image from Trieste is showing likelihood of a wall cloud beneath the cloud base.
Supercell on webcam from Trieste. Source: Radio Punto Zero, Trieste
Cold front which crossed the region in the late morning hours continues further east across the northern Balkan states. Follow the ongoing situation on Slovenia radar, Croatia radar, Hungary radar and satellites.