The schnorkel is detectable by radar, from about 5km. This figure is based on some quick Single mission test, so it's probably not very accurate.
I guess the visual detection range is also close to 5 km, maybe even less.
Regarding the aircraft activity, I also think they are less active by night, and I never saw one during the storm.
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Originally Posted by FIREWALL
I can bring on bad weather by going 1024 tc and go 128 tc for 24 hrs to get bck to good weather. 
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Didn't know that. Thanks for the tip.