Mammatus Clouds Observed over Berlin, Germany
May 04, 2021
Photographer: Eric Maltz
Summary Authors: Eric Maltz; Jim Foster
These eye-catching mammatus clouds appeared just after a turbulent, late afternoon thunderstorm moved through Berlin, Germany, on March 11, 2021. The pouches form when colder air moving downward within the cumulonimbus cloud structure pushes into the storm's cloud base. Mammatus are more often seen following a severe storm than preceding it.