From the Popular Mechanics Science Blog:
The Cassini spacecraft has revealed a giant storm on Saturn that measures about 5000 miles wide, about two-thirds the size of Earth. NASA observers liken the storm to the red spot observed on Jupiter.
Similar to hurricanes on our planet, the Saturn storm swirls around a relatively calm eye located at the planet’s southern pole. Its winds are estimated at speeds of 350 mph, while its clouds reach 20 to 45 miles into Saturn’s atmosphere. Scientists aren’t sure about the cause of the storm.
Wow. That’ll put things in perspective for you.