Here is the result of my efforts. Despite a pretty dire forecast I managed to achieve something from a well-timed gap, however thin. More info including comparison of cloud forecast and actual satellite image here:
http://philhart.com/content/partial-...pse-lake-bolac
On the right of the first frame is a hint of Mt Abrupt at the southern end of the Grampians 50km away. I had lined this up in Google Earth but wasn't sure if it would actually be visible. The far side of the lake was a bit higher than I expected.
Phil