Freezing Fog?

Here in Seattle there's this phenonmenon known as freezing fog that occurs when it's fucking freezing outside and then there's some fog that rolls in. What can you do with fog? Hide, be obscured, get haunty.

I like the mental image of freezing fog, cuz it sort of makes me think that suddenly the freezing fog could emerge creating a giant ice wall.

BUT THAT WILL NEVER HAPPEN!