Click the image to see NASA's Cassini mission page.
The shadow cast by Saturn's rings has a strong seasonal effect, and scientists theorize that the seasonal change kicked off the powerful storms. Periodic, huge storms called Great White Spots have been observed in previous Saturnian years (each of which is about 30 Earth years), usually appearing in late northern summer.
Here's what it looks like now (in infrared):
Click the image to see the Sky & Telescope site.