My entry for the weekly photo challenge is a little bit later then usual, as I was on holidays in Portugal.
During the visit in Porto we watched the view of the city and the Duoro river very often and on one of the days the view changed rapidly because of a cold sea fog, which was following the river into the city.
In the first photo you can still see the bridge.
In the second photo you clearly see the fog is hiding the bridge.
In the third photo you can see a little bit of the bridge again.
After the short lunch break we took after taking these photos, the sky was clearly blue again.