In July I spent some nights in the small town Stade, just west of Hamburg.
One of the days I went for some biking along the river Elben - crossing it two times before returning to my hotel.
On the last river crossing it was clear that the chance for rain was overwhelming and arriving at "my side" of the river with still 15km back to my hotel I had some serious rain, hail and thunder - or in general a very wet return...
The photo above from the last river crossing as the clouds start to look threatening.
Under as I was seeking shelter at a gas station in the worst showers: