Starnberg Lake Protected Munich City Center from Supercell
Munich, Bavaria, Germany – On May 6, 2026, a powerful supercell storm, initially on a trajectory to strike Munich’s city center, was notably diverted by the cold waters of Starnberg Lake. This natural phenomenon, reported by meteorologist Jan Schenk, protected the heart of the Bavarian capital, though it redirected the storm towards the city’s southeastern districts and beyond.
Cold Water Diverts Storm’s Path
The supercell originated from the Füssen area and was heading directly for Munich. However, upon reaching the vicinity of Ammersee and Starnberg Lake, the storm’s path shifted dramatically. Instead of hitting the city center and northern Munich, the supercell veered right, impacting primarily the southern and southeastern parts of Munich before moving towards Passau, Austria, and eventually the Czech Republic during the night.
This distinct deviation is attributed to the temperature difference between the lake’s cold spring waters and the surrounding air. In spring, large lakes like Starnberg Lake are still relatively cold, creating a cushion of cool air above their surface. Supercells, which thrive on thermals and rising warm air, avoid these cold zones. The storm, seeking the path of least resistance, circumnavigated the cooler area, resulting in a southern loop. The inherent tendency of supercells to turn slightly to the right due to their rotation further amplified this deflection.
Increased Risk for Southeastern Areas
While Munich’s city center was spared, this natural diversion comes at a cost for the southeastern outskirts of Munich and regions further east, such as Passau. These areas are more frequently affected by severe thunderstorms due to this recurring meteorological phenomenon.
Reversed Effect in Summer
Conversely, in summer and early autumn, the same lakes that offer protection in spring can intensify late-day thunderstorms. When the water is significantly warmer than the air, it provides additional energy and water vapor, acting as a fuel for storms. This can cause supercells and other severe weather systems to intensify just before reaching the Bavarian capital.
Landscape Shapes Storm Trajectories
Lakes are not the only geographical features influencing thunderstorm paths in Germany. Mountain ranges and hills can act as natural barriers, altering the trajectory of severe storms. Storms may dissipate rapidly on the leeward side of these formations or intensify in other areas.
Oceans as Storm Engines
Ocean water temperatures also play a crucial role in influencing the direction and intensity of storms along coastlines and inland. For instance, the temperatures of the tropical Atlantic are often responsible for the formation of major tropical storms and hurricanes, with water temperatures being vital for predicting their course. The unusually warm North Atlantic and northern seas this summer suggest a potentially stormy summer for 2026.
