Supreme and Volumetric Fog
With Supreme and Volumetric Fog on board, you'll notice a change to the foggy weather that sometimes envelopes Skyrim.
The popular mod tweaks the fog to make it look more realistic. It also adds effects to make it appear more dense, a change that looks especially gorgeous when you're traveling in the forests and bogs outside of the game's cities and towns.
It's currently one of our favorite immersion mods for Skyrim Special Edition.