Lake Burrendong is near Wellington ,NSW. It’s a bit over four hours drive from Sydney.
There we’re large storm clouds directly above us, while this cloud was highlighted in the afternoon sun.
The original liked like an Atomic cloud behind the hills.
After a bit of manipulation ,it looks like mashed potato and gravy.
Three exposures processed in Photomatix Pro- Atomic then through Lightroom and mashed Potato through Macphun