From the BOM Frankston Wind Meter - 6 am to 6pm 5 Sept 2012 :
Gust hit 41 knots 9.24am and 43 knots 12.57 pm, but both times the gusts a few minutes either side were around the 35 knots, with the wind speed 25 to 30 knots.
No idea how representative the reading is to surface wind on the beach. Meter at 6m elevation, location ?? 12km inland ??
Source :
www.bom.gov.au/products/IDV60701/IDV60701.94871.shtml