Based on the experiences of others as reported here, IIRC using high TC can make the game's weather get stuck or change less frequently relative to date/time in-game. It may be that the in-game weather is linked more to actual playing time elapsed than how much time is passing on your virtual uboat while you're running at a high TC. Just a guess, but for whatever reason there does seem to be a correlation for some people to high TC and lack of variety in the weather.
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