Fog in one area and snow-storm styled...snow

I’m working on a remake of this level from Time Splitters 2. I need to have fog in one specific place. I tried using Func_dustclouds but for some reason the clouds only appear at the surface of the river.

Also, is there a way to make a snow storm?

Thanks if you can help.

func_smokevolume for the fog might work.

And snow storm is best accomplished with custom particle effects.

Good luck with that map, I remember playing it, I look forward to seeing progress…

Func_smokevolume/dustcloud has a limit to how many particle children it may have.
try upping the size and spacing and lowering the density

Alright thanks.