I suspect the main difference is a single mission uses one and only one .mis file, campaign loads a dozen or more when you start a new patrol. For the WIP "GONE ASIATIC 3" mod I've been trying to limit to editing only two, US_NavalBases.mis and EastAsiaCampaign.mis, but the traffic gets kind of cluttered and makes sorting out waypoints totally nuts.
Not giving up yet though, possibly the programming takes the weather from the first one loaded or the last one loaded, or based on time of year or something.
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