This picture shows a (possible) roll-cloud. It passed to my north (direction this picture was taken in) as it moved east (to the right).
On the evening of august 27 2016, going into the night of august 28, several severe thunderstorms lit up the skies of the eastern parts of the Netherlands, going into Germany. These storms had a high frequency of lightning over the course of several hours. This provided a nice opportunity to take some lightning pictures.
The pictures where taken with my phone, so unfortunately the quality’s not so good.