Any way to "hack" weather generation to manually force fog?

[CaptainRude91]

There is no way to accurately set visibility / RVR unfortunately. Only this aerosol slider (or whatever they called it now) which doesn’t go below 3 km or so.

Ability to change Meteorological Visibility / RVR

The current weather system does not allow a visibility below approximately 3000 m (aerosol density 100%) and no low visibility take-offs and or landings are therefore possible. It is possible to put the cloud ceiling on ground level, but precise control of visibility / RVR is unavailable currently. Also “aerosol” sounds fancy but its not very practical it would be better to change it to visibility / RVR with absolute values in meters / km or miles rather than %.