Hi 3Jane
It's not clear from your post, were you attacking during daylight hours? I suppose those 140 meters, were they 140 meters distance when you were submerged?
I would not be too surprised if a periscope or even the top of the conning tower would not be spotted from 140m on rough weather with heavy fog. Sometimes weather on the high seas can be that bad...
As about targetting and hitting something on that weather, it's not that impossible. If you read some of the stories on uboat.net you'll see that seasoned kaleuns did their job against quite adverse conditions... I suspect being able to track a ship with the scope on that kind of weather was not too realistic, but in real life if you were really close and having shadowed the convoy for a while would be enough calculate a torpedo shot at a small distance.
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