To amplify a bit:
I've been leary of putting my oar in and complicating matters, but Hitman is correct. Fog is a suspension of water droplets in air, and any decent amount of wind will disturb that equilibrium so as to remove the fog. As a former long-time resident and sailor in the San Francisco Bay area, it is infamous there. The same holds true of higher temperatures as well, as the air can better absorb the moisture. The sun will literally "burn" it off in the absence of any wind.
On the other end, very strong winds literally blow off the tops of the waves, causing a similar effect from a different cause - lower visibility. The resulting spray is so thick as to be similar to the fog. Anything in between is clear as far as vision goes.
But as I am not familiar at all with the code and what it is possible to code in game, I will leave it at that.
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