LOL! because I am a total dork, I actually made a list on a post-it of "types of weather" and then I'm going along a trying to come up with a prompt for each.
I actually took a leaf out of your book and googled 'kinds of weather' and managed to come up with 6 prompts. 'Flood' is proving to be problematic, because no one wants to have sex in one LOL. Prudes!
You know what's funny...I've actually read a really wonderful m/m romance novella, that is about flooding...Waiting for the Flood by Alexis Hall. So it CAN be done. ;)