i figured it out! i'll explain it so that everyone can do it
HOW TO MAKE WEATHER FOR YOUR WORLD:
this guide to change the water color is pretty much what you also do to make weather:
http://www.modthesims.info/showthread.php?t=388840
but instead of the sea files you are going to be changing the ini files of the sky. (remember to back up you original ini files)
the 6 ini files you'll need for the sky:
SkyCommon: open this file and change the "generate new cloud cover every N hours" to 5 (remember to save the file before closing it)
Sky_Stormy1
Sky_stormy2
Sky_StormySky
Sky_StormySea
Sky_StormyLight
in s3pe you open your world a you need to import all these files one by one.
first you go Tools-> FNV ****. In here you type in the name of the file exactly as it is, including the capital letters. Click "calculate". Highlight and copy the FNV64 value.
next, go Resource->Import->from file. Navigate to the folder where you have prepared you ini files. If you do not see your files in that folder, make sure you have "see all files" setting on. Open the file who's name you just ****** in the previous step. In the window that pops up, in the box INSTANCE you paste the ****** name. In the TYPE box, paste in this: 0x1F886EAD. Then click OK and the ini should be added to your world.
Repeat this process for the remainder of your files. Save the world.
Now you should have nice clouds in your game :)