Just read an article about a storm on Saturn that is almost the size of EARTH. It leaves these swurls afterwards like a big trail of crap. I found an article and a video. The video is kind of lame, but it is something. No voting, VIEW and DISCUSS.
While the main spot is about 3,600 miles across the whole system including the tail streaming off to the right is more than 36,000 miles long.
Read more at DailyMail.Co.Uk