The sort of fog caused by warm moist air moving over colder water often clears up as you approach a shore-line with the wind blowing off it. This is because the air is dried as it passes across the warm land, and it’s especially noticeable amongst islands.
Closing a weather shore in fog, you can have every hope that the air will clear before matters become critical. The Isle of Wight often leaves sharper visibility in the Solent than outside. Jersey and Guernsey can work wonders, and on the comparatively rare occasions when sea fog drifts into Western Scotland, the coast is studded with islands capable of delivering a ‘fog lee’.
