You can't drag it down?
Anyway, just add a horizon mesh.
You can add weather without actually going down there, if you remember the name of the "atmosphere" setting your map is on and know 2 other weather/amotpshere presets to use. They need to go into a text file anyway
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Worst case scenario, once you finalise the map, get loading & preview images in, etc I can do the weather for you.