[jasondef]

Yes, this is a game bug, and no way to mod-fix it unfortunately. I've read many posts on this just over the course of the past two months, and its a famous problem. Doesn't happen all the time, but often enough to be annoying. Deck/Flak guns become unusable over 7knts wind speed I think, and I find once those weather conditions occur on any patrol I go on, I can pretty much forget about using them for the rest of the patrol, as the weather stays bad the entire time. So use the heck out of your deck gun early in your patrol if the weather's good if you ask me, cause there's a good chance you won't be able to use them at all later on in the patrol!

I did notice one thing once. I was suffering a storm one patrol for a straight week, and decided to sneak into an enemy harbor (Scapa Flow or Lock Ewe, I forget) for some moored capital ship tonnage. Once in the sheltered harbor, the seas calmed of course. I farted around in and out of the harbor for maybe 10 hours or so, then when I got out and started getting back into the open ocean, the weather stayed calm, the exact same conditions as when I was in the sheltered harbor! So maybe going into a harbor, letting the sea calm down, then going back out may "reset" the weather, but it could've been a coincidence, not sure about that. Risky going into those harbors though, for other obvious reasons.