360° panorama by Bernd Kronmueller.
Click the image to open the interactive version.
The valley you can see is Nant Ffrancon, leading to the Menai Strait and Anglesey. Through the clouds you can see (from the left) Tryfan, the Glyders, Snowdon (further back) and Y Garn. The rest of the valley and everything east was covered in clouds. The clouds started at about 400m and ended at about 700m. It was quite a view!!