There was nothing unusual about the weather yesterday or this morning. It was partly cloudy last night, and humid. It must have been clear enough to get a good inversion, because there was a thick, uniform layer of fog over the low areas.
Low fog bank
This was about as flat-topped a fog bank I have seen from up on the mountain. The cloud visible against the mountain in the distance is a layer of thinner, less uniform cloud just on top of the fog.
That looks so much like the fog over Monterey Bay, with the peninsula in the distance. Really nice photo.
The picture doesn’t quite capture it. The fog was as smooth and level as a lake, and it was thick enough that there was no way to tell what was under it. If I didn’t know better, I might guess that it really was over a lake.