According to the image above, the area with the highest probability for thunderstorm development can be located over the Alps and Italy. This is exactly where a big thunderstorm complex has developed. But the area with Showalter indices below 3 units, which means high thunderstorm probability, is much more extended. Therefore for a diagnosis and prognosis of thunderstorm complexes, additional conditions and methods have to be investigated. There will be a separate chapter showing the thunderstorm development from 12.00 UTC onward.