weird winter clouds in 4141
 

saw this in a rebuild of a mission, changed the time and it went away.

Propably it is a problem with the mod you use. Check it in a clean install without mods to see if it still there

That's the ice wall, i noticed it on the NWEurope map as well, it used to go up about 100 feet, and not it's all the way up to heaven, as your photo shows.

I am using a clean install, it's there in the game, not a mod anomaly.
You can only see it from low down, at alt it goes away or blend seamlessly into the horizon.