Anyone know the exact definition of a storm? I can't seem to use my Deck gun or AA gun in a sea with a light chop...clear weather and no fog...and it says this is a storm.

Its seems in campaign when I am in a light or rough chop AI can shoot at me with deck guns but, I cannot shoot back because it says guns cannot be manned during storms and then my weather reports there are no storms. Is a storm by definition in the game choppy water? and can you only man guns when water is like glass? and why doesn't AI go by the same logic? I am not sure if this is a bug or not I haven't seen anyone else post it. But, nothing in manual describes different types of weather and what the defined limits are. i.e. what exact conditions allow you to fire etc.

Any help will be much appreciated. I'm just anxious to use my deck and flak gun but, never get the chance to because of the somewhat rough water around enemy and neutral areas....it seems i can only man it around germany....Is anyone else having this problem?