on a different note, I've just read that Nevada Skies is supposed to be loaded
before Fellout to make both work together. here is the relevant section from the FAQ on nexus:
Q: Does NCSkies work with Fellout?
A: Yes! NVSkies is compatible with Fellout since Fellout v1.0. To get NVSkies run along with Fellout without complications place Fellout after NVSkies in your mod load order! You have to disable all NVSkies "weather" conditions via the Hygrograph. Note I said WEATHER settings NOT storm! Sand/Rain/Snow/RADstroms will still show up. NVSkies "weather" setting cannot be used in parallel without causing conflicts since Fellout uses its own "weather" settings!
http://www.newvegasnexus.com/downloads/file.php?id=35998
after running BOSS Nevada Skies is always sorted after the other one, so it has to be changed manually. If I'm missing something, like new updated versions of those mods, let me know please.