Fig. 7: Distribution of four sounding variables for the Northern and Southern Alpine regions.

a CAPE, b precipitable water, c surface wind speed, d 6 km wind speed. Thunderstorms from the NW Po valley and S Prealps are assigned to the MIL sounding, while thunderstorms from the Jura, Swiss plateau and N Prealps are assigned to the PAY sounding. The boxplots depict the median (centre line), 25th and 75th percentiles (bounds of box) and 5th and 95th percentiles (whiskers).