A rare and ‘spooky’ weather phenomenon has been pictured on a Welsh mountain.
Peter Green was walking in the Brecon Beacons when he came across the unique “rainbow ring”.
The beautiful sight was spotted up Fan-Y-Big in the Brecon Beacons on Thursday.
Pete shared the images on Twitter, and Welsh BBC weatherman Derek Brockway confirmed it was actually a Brocken spectre.
Named after the German mountain on which is was first noted, a Brocken spectre is a large shadow of an observer cast onto cloud or mist.
The Met Office said it is what happens when an observer stands on a hill which is partially enveloped in mist and in such a position that their shadow is thrown on to the mist.
If it all lines up correctly they may get the illusion that the shadow is a person seen dimly through the mist.
The illusion is that this person or ‘spectre’ is gigantic and at a considerable distance away from them.
The sun shining behind the observer projects their shadow through the mist, while the magnification of the shadow is an optical illusion which makes the shadow on nearby clouds seem at the same distance at faraway landmarks seen through the cloud.
Watch the Brocken spectre on Snowdon
Similarly, the shadow falls upon water droplets of varying distance which distorts perception and can make the shadow appear to move as the clouds vary and shift.
The Met Office said: “This all combines to make the rather disorienting effect of a giant shadow moving in the distance.”