G33,
That overcast scenario with the ridge tops in cloud is wonderful, I agree. The clouds cut the light to a soft glow, and the shadows disappear so things look almost like a model of the world.
It is cool, unless there is a 50 cal team on the ridges at the military crest, shooting down like we are fish in a barrel (25 miles west of Tra Bong, as I recall). You can pull the seat cushion up into a small dough ball from the adrenelin.