Saturn's moon Titan has a thick atmosphere of methane, which means it may have a geography very similar to ours. You know, plus methane and at extremely cold temperatures. But we're just now seeing the first images of the moon experiencing a mighty methane rainstorm.
What you're looking at appears to be a gigantic rainstorm and resulting flood near the equator. Those dark blotches are flooded areas, and the white wisps are methane clouds that have just dumped onto the surface.
Pretty cool! Although I still don't think I want to visit.