If this is just a random bad storm, then yes, Control Weather is a perfectly fine solution. Too bad that may not exactly be the case here. I mean, we have a huge context clue here- it went around the lightning rod to hit a vital part of the airship, and it's happened after they've changed regions to Thor's skies. While the spell itself might solve the situation (we've yet to truly see, thanks cliffhanger), if this were Durkon, it would be completely out of character. Storms are sacred to him, and he'd search for the divine meaning rather than, "Welp, time to flip the bird to Thor's will." If this were still Adad's skies and this same thing happened, I wouldn't bat an eye, because yeah, Durkon sorta didn't worship Adad.