Originally Posted by MarvelKnight
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.
Yes, it was an effect of the Bifrost. The clouds broke up when it was destroyed. so that link is pretty clear, although it's never explained why it affected Midgard so that's just speculation.