Season of mellow mists

Woke up earlier this week to see a thick blanket of fog outside the windows - just the weather to stay in and revise for an exam.

Needless to say only too happy to get distracted from book study to try and remember my meteorology and work out why it is foggy.

My sailing book gives four possible types of fog:
a) radiation fog
b) advection fog
c) frontal fog
d) sea smoke

Which do you think it is?

Answer tomorrow, but in the meantime guess what I saw when it burnt off later in the morning (and that is a big clue as to the fog type)?


Yup, the bubbler was out.

Better keep out of that water, folks!