Saturn 18th March 2009.

Here's an animation of the storm on Saturn. This time it isn't a Moon.
The timestamp was 21:36 to 23:14 UT

Below is an L-RGB image taken at the start of the session.

Storm on Saturn 14th Feb 2009.

Good seeing tonight... at last, and I think I've picked up a storm in one of the belts.
Colour to follow in the morning.

Saturn’s Long-lived Storm - Cassini

It's not a Great Red Spot, but this view shows the longest-lived electrical storm yet observed on Saturn by Cassini.

Also spotted by Cloudy Night forum imagers.

Credit

Saturn 15th Feb 2008 - Storm detected.

I can now confirm that this feature imaged here is a storm on Saturn.