Fog Bow

A Fog Bow is a similar phenomenon to a rainbow, however, as its name suggests, it appears as a bow in fog rather than rain.
Because of the very small size of water droplets that cause fog the fog bow has only very weak colours, with a red outer edge and bluish inner.

Odd thing is that not everybody picked up on this, The guys on the Bridge did not notice it until I pointed it out, they just thought I was nuts taking pics of the fog