Multi-week forecasts of tropical cyclone genesis are evaluated for the 2017-2018 Southern Hemisphere cyclone season. These forecasts were created with the Australian Bureau of Meteorology's new seasonal forecast system, ACCESS-S. Forecast performance over the season showed positive Brier Skill Scores with good forecast reliability and improved skill over climatology out to week 3. ACCESS-S provided guidance of the formation of major cyclone events during the season at more than 2 weeks lead time, including Cyclone Gita in the South Pacific which later devastated Tonga, and the landfall of Cyclone Hilda in western Australia.
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