C:\game directory\data\submarine\subname\file with cfg extension\ and then find the storm line under sub properties heading. You'll see the number for the windspeed; simply change it to the number you desire. If you set it at 15 you can use both guns in any weather, as both guns are limited by the same entry. Use your judgement and sense of fair play. Here's an example:
StormConditions=9,0.4;max wind speed [m/s], max rain intensity [0,1]
In the above, change only the "9" and nothing else. Don't forget to save before closing. Use a text editor to open the file.
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