On the ground, eyewitness video (below) reveals a darker and more menacing perspective of the twin vortices.
“Germany, while boasting … just 10 per year, appears to be near the heart of Europe’s stronger tornado alley, which generally runs from northeast France toward Poland,” says the website USTornadoes.com.
Instances of twin tornadoes are extraordinarily rare in Europe and even an unusual occurrence in the United States, the tornado capital of the world.
The most notable recent case of twin twisters in the United States occurred in Pilger, Neb., in June 2014.
A warm, unstable air mass over central Europe helped spur the unusual storms over Germany. Temperatures were about 5 to 10 degrees Celsius (10 to 18 degrees Fahrenheit) above average, and moisture levels were unusually high.
Flooding in central Europe killed at least 18 people. In Paris, as the Seine river rose to its highest levels since 1955, thousands of works of art stored in the basement at the Louvre were moved to higher ground.