Another thing I've thought of is that the tornado did occur at the start and Max was able to rewind back to where it started forming somehow. And she was supposed to save Arcadia Bay from getting hit with the tornado, but after she found out she had the power to reverse, she decided to change the destiny of everyone In Arcadia Bay, only to make the tornado stronger.
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Life Is Strange {Episode 1-4 Polarized/Polaroid Theory}
FanficLife Is Strange Polaroid/Polarized Theory. This is my second LIS theory. I would recommend reading my first one before reading this, or some parts may not make sense. Once again I made this entire theory up by myself. Contains: Minor use of Drugs...