A Good Man...

The sky is an image used throughout "A Good Man is Hard to Find." It is used several times in the story--after the grandmother was shot, shortly after we meet the Misfit, and other times. In a good short story nothing is thrown in there for the hell of it. What do you think the author is up to with her characters' description of the sky? How does it set the tone, reinforce the plot, add to the tension or conflict?  Give  two examples ( quote from the book) and explain them.