I don't know if this has been mentioned or not. But, I read on some message board a while back some discussion on weather changing and how long it takes, etc.
It mentioned something about an internal clock or time mechanism occuring before the weather change would take place and this appears to be true. It was discussed that saves during the mission might restart this weather time period. Thus, if you're making frequent saves during the mission, you may never see the weahter change because you keep restarting this weather time period. Just a thought.
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