Actually,
Fog behaviour across the Sydney basin is interesting to study. The circulation of the airflow I guess partially influenced by the ranges to the west and synoptic conditions all impact on what regions experience fog. Obviously the Nepean Valley experience quite a few fog days each year (Harley will remind us of these statistics I guess). However, certain areas are more susceptable to fogs than others. In my opinion, this is in response to the atypical airflow that dominates creating regions of higher moisture and also cooler air. Schofields where I live does experience extensive fogs but I doubt as much as Richmond does. I am sure the urban heating has a significant effect on the occurrences of fog.
We experience a fog here this morning which seemed to clear during the late morning - moreso than yesterday's fog which seemed to be breaking just after sunrise.
Regards,
Jimmy Deguara