Hi!
I think the jetstream caused most problemes for navigating long distances over water. The existance of jetstreams was not known to the crews until quite late in the war. The pilots had never had problems with jetstreams until the B-29's started to fly very high for long periodes of time. I don't think jetstreams affected bomb aiming in any serious way once the bombers had reached their targets.
Skarphol
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