The images show the displacement of the key parameters TFP (left image top), WA (right image top), PVA at 300 hPa (left image bottom), surface (right image bottom) and finally upper level height (image below). Some of the key parameters clearly support the development of Rapid Cyclogenesis, such as the TFP which for the first time during this case study develops an Occlusion - like configuration extending from Cornwall to south-east Ireland for 18.00 UTC. Also the WA maximum intensifies markedly by 18 UTC over Cornwall and Ireland. On the other hand the surface low retains its strength without any intensification during its eastward movement, as does the PVA maximum. As can be seen, the upper level low moves slowly south-south-eastwards, while its vertical axis becomes more perpendicular.

Summarizing, from the diagnosis of the 06.00 UTC situation and the VSRF of all relevant key parameters, many clues can be found for the occurence of Rapid Cyclogenesis. This will be verified by the sequence of images.