I took a look at the site...and the storm. The site is not official - and the Cyclone was certainly not Cat III. Clare peaked at 09/0000Z with sustained winds of 60 kts and gusts to 75kts, i.e., a strong tropical storm. Follow-on news reports from Perth indicated nothing unusual about Clare (except that Perth was likely to exceed its normal January rainfall total in one day).

I cross-checked against the storm bulletins (courtesy of the University of Hawaii) and found a maximum of 60G75kts. A check of satellite imagery from NRL showed that Clare never formed an eye, so even minimal sustained hurricane strength was not likely.
Hope this helps.
ED