Hashem is reminding us of the wisdom of creation. How often do you think about why trees lose their leaves in the fall? Now you know the answer- because if they didn’t, the trees would fall down in the snow! By sending an early storm before the trees were ready, Hashem showed what would happen otherwise.
It’s also a bracha in that the hurricane produced a bumper crop of mosquitoes. They’re all gone now. It also put an effective end to fall allergy season.