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IDK about the 45 degree angle. It could just come in from the side, above the cool air moving out. Wind is going to alter the angle, at any rate. The atmosphere is fairly thin sheet in cross-section.
Yeah I mean I was very much simplifying the process, it should be more considered an average approach angle. I figure it must be drawn in from above the cold air that is moving away, but it's not coming from directly above because humid air is rising.
And even as I said "hot air rises", I knew that could be nitpicked. I even nearly reworded it to "hot air tends to rise" but it essentially means the same thing. I understand WHY hot air rises, rather than just blindly accepting it as some magical property of heat. It's gravity and density at work here. Hot air is buoyed by cold air, that's probably a more accurate way of saying it! It's not quite as slick a phrase though.
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