Tks Mr 'Q',
Would that be the one of the evening of 20.1.2010..??
I drove thru similar on the way back to Perth from 'warmer climes' in BRM, and that looks just like the one I drove thru about 50k's or so S of the Coast H'way turnoff to NWN.....
Shook the 'ole Patrol a bit and vis from the dust / downdraft was ZERO....