Imgur comments: http://imgur.com/7gdhWca
Reddit comments: http://reddit.com/r/pics/comments/2qqj6a/massive_hurricane_on_saturn/
Stashed in: The Universe, Space, NASA, Weather!, NASA to Me, Space!, Space, Images
Reddit comment by cabuki:
The hurricane is about 20000 miles across, which is about 2.3 times the diameter of the earth. The eye that is in the picture is ~1750 miles across, which is about half the width of USA at the widest.
Scale comparison by jmarsh376: