Jonathan Herreman has produced this great real-time capture of an “arcus” formation. It shows how the arcus, also known as a ‘shelf cloud’, is a feature that extends out at the base of a Cumulonimbus storm cloud in front of the direction of the storm’s movement.
![Arcus](https://cloudappreciationsociety.org/wp-content/uploads/2014/09/Arcus.jpg)
Passage de l’orage (arcus) /storm – Knokke (Belgique – Belgium)
September 29, 2014