Although thermal layers are not modeled, the sea state can have a nasty effect on your stealth.
The rougher the seas, the more chance of Broaching the surface, which literally means all surrounding surface units will see you during an attack. Even just a little of your tower pokes out of the water, sends the escorts into crazy mode!
Be careful! You may need to go deeper than periscope depth, and that means having the scope washed out more!
But, with a rougher sea, the escorts have a harder time detecting you with ASDIC.
Good luck!
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