Ghost Under the Cliff by Emili Vilamala Benito
Photo location: Tavertet, Barcelona, Spain
Camera: Sony SLT-A99V
On the cliff of Tavertet in Barcelona, Spain, with the sun low behind and the valley of Sau covered with fog, Emili waited until a Brocken Spectre appeared. "In this geographical area, you can see these phenomena due to morning fog, and when it fades, it is possible to see this spectacular optical phenomenon".
A Brocken Spectre is a large shadow of an observer cast onto a cloud or mist. So, when a person stands on a hill partially covered in mist or cloud, their shadow can be projected down onto the mist or cloud if the sun is behind them. An optical illusion then makes the shadow appear gigantic and at a considerable distance away from them. The shadow can also fall onto water droplets of varying distances, which distorts the perception and can make the shadow appear to move as the clouds alter and shift. This combines to make the disorienting effect of a giant shadow moving in the distance.
Voting has now closed.
Winners will be announced on Thursday, 6 October via RMetS Instagram stories at 6 pm (BST) before being shared on the Royal Meteorological Society's website and other channels.