The 2018–19 Australian region cyclone season was an average season that saw the formation of 11 tropical cyclones, six of which intensified further to become severe tropical cyclones. The season officially began on 1 November 2018 and concluded on 30 April 2019; however, as evidenced by Tropical Low Liua in September 2018 and Tropical Cyclones Lili and Ann in May 2019, tropical cyclones can form at any time of the year. As such, any system existing between 1 July 2018 and 30 June 2019 would count towards the season total. During the season, tropical cyclones were officially monitored by the Bureau of Meteorology (BOM), the Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) in Jakarta, Indonesia, and the National Weather Service of Papua New Guinea in Port Moresby. The United States' Joint Typhoon Warning Center (JTWC) in Hawaii, and other national meteorological services such as MetService in New Zealand, Météo-France at La Réunion, and the Fiji Meteorological Service (FMS), also monitored parts of the basin during the season in an unofficial capacity.

Severe Tropical Cyclone Savannah was a strong tropical cyclone that brought significant impacts to Java and Bali and minor impacts to Christmas Island and the Cocos (Keeling) Islands during March 2019. It was the sixteenth tropical low, sixth tropical cyclone and third severe tropical cyclone of the 2018–19 Australian region cyclone season. Savannah developed from a tropical low that formed well to the east of Christmas Island on 8 March. The system was slow to develop initially, but reached tropical cyclone intensity on 13 March after adopting a southwesterly track. Savannah underwent rapid intensification and reached peak intensity on 17 March as a Category 4 severe tropical cyclone on the Australian scale. Ten-minute sustained winds were estimated as 175 kilometres per hour (109 mph), with a central barometric pressure of 951 hPa (28.08 inHg). One-minute sustained winds reached 185 kilometres per hour (115 mph) at this time, equivalent to a Category 3 major hurricane on the Saffir–Simpson hurricane wind scale. Weakening commenced soon afterwards, and responsibility for the system passed from the Australian Bureau of Meteorology to Météo-France. As it moved into the new region, Savannah became the eighth of a record-breaking ten intense tropical cyclones in the 2018–19 South-West Indian Ocean cyclone season. Savannah was downgraded to a tropical depression on 20 March, and its remnants dissipated in the central Indian Ocean on 24 March.