Re: Clouds in the sky on Earth during Loki and Thor's fight
While they were fighting Loki left the Bifrost engaged. Though it was destroying Johtunheim and not earth, I think the fact that an entire world was on the verge of being destroyed would be felt throughout the cosmos/other realms. That's my thinking at least.
"Well, I guess the laws of physics cease to exist on top of your stove!"