so im trying to under stand but dont so i want to post this if it is a mod cap issue or just the mod but it is something about NBT tag thou. Latest Version of mod and Latest Rec Forge version. After the crash i have to delete Weather2 from the world folder to make it work again or it will crash on the start of the world while trying to load the data from the Weather2 world folder.

Can't help without an actual crash report. Resubmit the issue with the crash report or full log.