This is towards the begining after Bill and fiance met up with Jo and then they leave to chase a tornado and then Bill remebers the divorce papers. Anyway they end up at a gas station and towards the end of that seen, Bill is outside and Dusty comes up and they say "goin green," the sky is green. Dusty goes to round-up the others and then they leave to chase it, but the sky if bright and sunny, and blue then!