The cyclogenesis in the Western Mediterranean was triggered by intrusion of dry, stratospheric air from north, north-west. The jet
streak played the important roles in the process of cyclogenesis which can be followed through the satellite images, but also through relevant
numerical parameters.
The big cyclone moved from the Genoa Bay down to south, south-east with small, similar processes (cyclogenesis) over Adriatic Sea
and Central Europe. The upper level and surface low was well develop almost from the beginning of the process. The temperature advection showed
the typical distribution for cyclonic circulations and the height of PV=1 indicated the intrusion of the dry, stratospheric air down to the 600 hPa.
The mechanism of Mistral was followed by vertical cross section. The VCS of wind field parallel and perpendicular on the coast of France showed origin, persistence and strenght of Mistral.