Sea fog/Haar. Formed when air which is close to saturation passes over a colder surface ie the sea. This causes cooling of the air mass so bringing the temperature down to the dew point. The moisture condenses out as fog or drizzle. This is a more dynamic process that the gentle cooling over land which is why sea fog can be found in 40kts of wind. Incidentally in my experience of the East Coast of Scotland it is more prevalent in SE rather thn NE winds.