This just in from Steve with Kitepower about Southerly Busters ...
"It would be a good idea to post links to the BOM website where these things can be seen and forecast.
http://www.bom.gov.au/weather/nation...synoptic.shtml
That link shows a typical cold front just below the bight, in the bottom centre of the chart. When this moves over land, particularly as it moves across and up the South East coast of Australia, is when the "Buster" occurs. Its called that because it busts things, mainly because the wind suddenly switched direction up to 180 dgress and rapidly increases in strength, often up to 30-40+ knots, and not always with tell tale cloud lines.
They tend to occur at the end of a period of Noreast winds as a high pressure system has moved off the coast easterly towards NZ. "