Following a downpour over Batz-sur-Mer, France, Matt Minshall (Member 7,721) was mesmerised by these Stratocumulus stratiformis asperitas clouds. The asperitas cloud features take their name from the Latin for ‘roughness'. These rare, turbulent, and irregular waveforms were acknowledged by the World Meteorological Organization relatively recently, when they added the classification to the International Cloud Atlas in 2017. Asperitas clouds tend to form near Cumulonimbus storm systems, and they can make the sky look like an inverted stormy seascape. The Cloud Appreciation Society first proposed asperitas as a new cloud type in 2008, and its formal recognition is largely thanks to members like Matt submitting sightings like this from across the world. Thanks, Matt.