The states of Bavaria, Saxony and Saxony-Anhalt were particularly hard hit, with five cars stranded by waves of water and mud on the A14 motorway north of Halle in Saxony-Anhalt.
The storms also caused a train accident in the St. Goar in the Rhineland on Sunday, when debris washed onto the track derailed an Intercity train carrying 800 passengers. The driver suffered a broken leg, while 14 other people on the train were injured. The track is expected to be closed for at least two days.
Earth and debris from nearby fields were also washed onto a 600-metre stretch of the A38 motorway in Nordhausen, in the state of Thuringia, police said on Monday, while a 36-year-old woman was blown from her motorcycle in northern Bavaria, suffering minor injuries.
Strong winds damaged roofs and uprooted trees in Magdeburg, where the fire service was forced to pump out several cellars. Police added that in some towns nearly three-quarters of the houses had been affected by the weather. Several thousand households suffered power cuts.