Vertical Cross Section Supercell: 9th June 2004:00UTC

Isentropes
The isentropes show a configuration typical for a warm front. At the warm side (54°N / 3 to 4 °E) we recognise a insertion of warm air yielding a zone of potential instability between 850 and 500 hPa.

The VCS was laid along the line indicated in the image below. From SW to NE.