FIONA-GWENDA

History

Severe Tropical Cyclone Fiona-Gwenda was an unusual storm that developed during the active 1973–74 Australian region cyclone season. The system first organised as a compact tropical low in the eastern Indian Ocean, reaching tropical cyclone intensity and being named Fiona on 6 January 1974. Moving inland over the rugged north coast of Western Australia, the cyclone quickly lost strength over land and was believed to have dissipated entirely. However, the remnant low tracked westward and re-emerged over warm Indian Ocean waters south of Broome around 9 January. Forecasters, unaware the system had survived, designated it a new cyclone and named it Gwenda on 10 January. Post-season analysis by the Bureau of Meteorology later confirmed that Fiona and Gwenda were in fact a single redeveloping storm, prompting the combined designation Fiona-Gwenda.

After returning to open water, the unified system re-intensified, reaching a peak of Category 2 on the Australian scale, with a minimum central pressure of 982 hPa and maximum sustained winds of 100 km/h, before weakening over cooler waters and dissipating on 13 January 1974. Its primary land impacts were confined to the West Kimberley coastline, which experienced prolonged gale-force winds. No significant structural damage or casualties were recorded. The storm is now regarded as a notable historical example of the tracking difficulties faced by forecasters during the early satellite era.

Sources: Bureau of Meteorology report Wikipedia