Iain Smith (Member 52,290), spotted advection fog from his window on Isle of Skye, Scotland. This can form as warm, moist air from out at sea blows in over cool coastal waters. It is fog on the move, carried across the water by the wind. ‘Speed, bonnie boat, like a bird on the wing,’ goes the Scottish folk tune ‘Skye Boat Song’ about Bonnie Prince Charlie evading capture in 1746. ‘Carry the lad that’s born to be King / over the sea to Skye.’