The clouds you see on Saturn’s northern hemisphere is actually a storm, one of largest and most intense storms ever observed on the ringed planet. This picture, captured on Feb. 25, 2011, was taken about 12 weeks after the storm began, according to NASA.
The clouds had formed a tail that wrapped around the planet. Some of the clouds moved south and got caught up in a current that flows to the east (to the right) relative to the storm head. This tail, which appears as slightly blue clouds south and west (left) of the storm head, can be seen encountering the storm head in this view.