Thunderstorms and lightning on Saturn

...imagine a thunderstorm with a diameter around 3000 km and lightning bolts whose radio signals are 10.000 times stronger compared to their terrestrial counterparts. These are the SEDs (Saturn Electrostatic Discharges) which are investigated in this project...

And in December 2010 a giant thunderstorm started in Saturn's northern hemisphere with a latitudinal extension of 10,000 km (see below)!

© NASA/JPL/SSI (Cassini ISS, image taken on February 25, 2011)