Orographic thunderstorms

orographic thunderstorms occur when an air mass meets an obstacle such as a mountain and is directed upwards instead of meeting another.
If warm, humid air masses flow over a mountain obstacle, they are lifted and made unstable.
The air therefore cools down and may condense. Under suitable conditions, a storm cloud forms.
These types of thunderstorms, orographic thunderstorms, can form huge amounts of rain in stagnant liquors because it is possible for them to form in the same place over and over again in some cases.
So it is not a big surprise that the frequency of thunderstorms is very high in the Bavarian Alps.
The reason for this is the advance of cold air coming from the north and the parallel rise of warm air masses close to the ground on the northern edge of the Alps.