The Issue your having:
Corosus your Weather2 breaks the betweenlands heavy rainfall

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Pictures:

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What Expecting to happen:
It to be event causing Heavy rain in dim

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Mods Affected:

• Minecraft Version: 1.12.2
• Forge Version: 2854
• TheBetweenLands Version: 3.5.10
• Weather2 Version: 2.6.12
• Server or Single Player: both
• Optifine: no
• SpongeForge: no

actually @Corosauce maybe add config to blacklist Dimensions so they can use there own weather system instead of Weather2 including The betweenlands event so what i mean is it ignores weather2 without conflicting or incompatible so you can blacklist them