29 July 1997 - Instability 18.00 UTC
29 July 1997/18.00 UTC - Meteosat IR image; yellow: Showalter index 500/850 hPa, magenta: zero line of Showalter index 500/850 hPa
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The Showalter index has negative values in the convective area, but the same considerations still apply concerning the discrepancy between the big scale of the area of high thunderstorm probability and the local scale of the real thunderstorm developments.