It's just one theory I've been floating around and the only one that I've fully put a lot of thought into.



With this theory Chloe didn't/doesn't deliberately cause the Tornado, it's her subconscious rage, anger and abandonment issues physically manifesting to take punish/destroy Arcadia Bay which has shat all over her in both realm and imagined ways.



This would potentially explain why it's still coming in the timeline with Alternate Chloe in the wheel chair, in that world it's caused by her potentialy resentment and neglect of people going on with their lives and not slowly dying painfully and not having a family trapped in crippling dept to keep their daughter alive in vane for a while longer.



Granted it would be horrible if this is actually the case, but given all the other supernatural stuff going on eg the butterfly, time travel itself and the doe as well as the stuff hinted at going on with the Prescotts and Rachel potentially having the rewind power (I mean she comes across as good at everything she tried out/did which reminds me of how Max can come across as smarter then she is and more if she rewinds convos to get optimal outcomes etc).



It's probably wrong but it's fun to theorize I think.