Total miner already has localized weather. You'll notice while you move around your map you will be able to enter and leave a rainstorm or fog.
I know that. Howeer, I am talking about storms moving around, gaining and losing strength, LIGHTNING, Tornados(I have a script for a tornado I can control somewhere...), hurricanes, radars, and more.
If you go on youtube, look up "Minecraft Localized Weather mod" you will see what I am talking about.