Many shades of grey

Fog, fog and more fog! I woke at 2am to the droning of three fog horns. They all sound on a different note and at various times. They sound so mournful, I always have visions of people bringing out their dead in plague ridden London. (My mind is rather mysterious!)
We, as an island, have been cut off from civilisation all day. It is very eerie driving around, headlights on and everyone going more slowly than usual. As I write this, the fog horns have started up again. It could be a long night.