When warm, moist air is advected and brought in contact with colder surfaces.

Recently I’ve been starting to think about a course I’ll be teaching later this year, and how it would be cool to have household examples for most, if not all, of the topics I’ll be talking about.

Fogged up bathroom window

So this is one example for advection fog: Warm, moist air moves against a cold window and condenses.

Of course you can also observe this over other cold surfaces, for example over the ocean:

In the movie below you can witness how the iceberg slowly vanishes as the fog closes in on the ship.

It can actually get pretty spooky.

On this picture you can clearly see that the fog is confined to a shallow layer directly above the ocean’s surface. We were standing on the deck above the bridge, and there we were up high enough to see that it is indeed a thin layer and that the skies above are blue. From the working deck it felt like fog had swallowed us up and the Black Pearl was about to appear…