Your analogy of the power of weather, nature and the oak tree is a way the author uses to depict Victor at the young age of fifteen. The destruction of nature and the danger which it can destroy is something like an oak tree is scary. To witness mother nature’s power on this level makes Victor realize the unpredictability in weather and life. Your analysis of the quote and it’s impact on Victor is evident it was a factor in contributing to the characters mood and thought and thus the transition to his interest in mathematics. And as you know, nature’s unpredictability will play a role later in Victor’s life when he will create something controversial using his knowledge of science and math to make it happen.