Here is a collection of sites where you can find descriptive language to talk about the sea, the sky, the storm, the thunder, ...and about anything you would like to describe in your stories:
https://descriptivewriting.wordpress.com/tag/describing-the-sea/
https://www.descriptionari.com/q/sky/
The Treasures of the Sea – descriptive writing
https://www.vocabulary.com/dictionary/stormy
https://www.englishbix.com/words-to-describe-thunder-and-lightning/
https://descriptivewriting.wordpress.com/tag/describing-battle-scenes/