Instead seeing this: https://www.google.com/imgres?imgurl=https://i.ytimg.com/vi/CHNAhgVs_Hw/maxresdefault.jpg&imgrefurl=https://www.youtube.com/watch?v%3DCHNAhgVs_Hw&h=1080&w=1920&tbnid=zt6Q4VAWxFvLcM:&docid=de3ox9P9LJZjQM&ei=BknPVo3VK4XJmAGP2oDwCg&tbm=isch&client=safari&ved=0ahUKEwiN8KrgxpPLAhWFJCYKHQ8tAK4QMwggKAMwAw
I see this: https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjzpOOnx5PLAhUD1CYKHQUdBSYQjRwIBw&url=http%3A%2F%2Fwww.allwallpaper.in%2Fvideo-games-minimalistic-minecraft-clear-blue-sky-2013-wallpaper-6875.html&bvm=bv.115277099,d.eWE&psig=AFQjCNGekiCIHFLLJZNQ-8hrwt7KmcPE4g&ust=1456511767108964I

https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjzpOOnx5PLAhUD1CYKHQUdBSYQjRwIBw&url=http%3A%2F%2Fwww.allwallpaper.in%2Fvideo-games-minimalistic-minecraft-clear-blue-sky-2013-wallpaper-6875.html&bvm=bv.115277099,d.eWE&psig=AFQjCNGekiCIHFLLJZNQ-8hrwt7KmcPE4g&ust=1456511767108964

Supply forge version and any other mods used so I can test this better, also orignal post links dont work.

I'm having the same exact problem, Coro.
Here's my info on what forge version I'm using and what mods I have right now:

Forge Version:
https://gyazo.com/d58eba0262eb93c7a92cdaa85f7942d7

List of Mods I am currently using with it:
https://i.gyazo.com/eccf20764416f62cc448f6b578bf3dc4.png

And as you can see here, the skies are 100% clear. No clouds, no storms, no nothing. Although I can actually HEAR storms just fine, but nothing is rendering in whatsoever:
https://i.gyazo.com/9eb457827c152bf16eec9da8b4fd1177.png

I haven't noticed any of you are using MapWriter, but I've done the horrible process of going through slowly adding mods back in until it doesn't work and I've found MapWriter breaks the Weather 2 mod. Not exactly sure why, but I believe mini maps are generally uncooperative and don't work well with some special rendering systems such as shaders.

Fixed in 4bdcc9a

release still pending.