A cyclone rapidly developed north of the state on the 10th reaching category three intensity early on the 11th as it tracked steadily to the southwest before weakening rapidly on the 13 -14th west northwest of the Northwest Cape. Although some offshore oil and gas activities were interrupted, at no stage were warnings issued for coastal communities.
For more information see the TC Willy Report (pdf)
Track and intensity
All times in WST - subtract 8 hours to convert to UTC.