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Yikes ... this one is a challenge to say the least.
I have about zero confidence in what I've come up with, but here's about the best I've managed ... without knowing what Jim saw. If Jim could do a "markup" on what he remembers, it would be interesting to see.
I think this one has four colors in play... blue / yellow & green / magenta being derived from the heavy overcast and I'm guessing a mountain range off to the right both acting as gobos from the cool overhead sky and warm direct light, so we get a four way mix, rather than a typical two or three way mix.