29 July 1997 - Instability 12.00 UTC
29 July 1997/12.00 UTC - Meteosat IR image; Showalter index 500/850 hPa, magenta: zero line of Showalter index 500/850 hPa
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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.