2019–20 Australian region cyclone season (HurricaneLucas4064)

The 2019–20 South-West Indian Ocean cyclone season was a quite active season for the basin. This cyclone season was an event of the annual cycle of tropical cyclone and subtropical cyclone formation in the South-West Indian Ocean basin. It officially began on November 15, 2019, and ended on April 30, 2020, with the exception for Mauritius and the Seychelles, for which it ended on May 15, 2020. These dates conventionally delimit the period of each year when most tropical and subtropical cyclones form in the basin, which is west of 90°E and south of the Equator. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion.

The first tropical cyclone was Intense Tropical Cyclone Ambali, which impacted Madagascar. Three cyclones formed in the month of December, with Moderate Tropical Storm Belna forming on December 6, Tropical Cyclone Calvinia, and Tropical Depression 04. Three tropical cyclones formed in the month of January, Diane, Esami, and Francisco. Moderate Tropical Storm Blake entered the basin from the Australian region in January, as well. February was the most active month of the season, featuring Gabekile, Herold, 11, and Irondro. March saw the formation of Very Intense Tropical Cyclone Jeruto, the first of such strength since the 2015-16 season. Tropical Cyclone Kundai also developed in March. April saw the final storm of the season, Lisebo.

Bureau of Meteorology
Since the start of the 2008–09 season, there has only been one list from which the Bureau of Meteorology has assigned names to tropical cyclones, despite still operating three separate tropical cyclone warning centres (TCWCs) in Perth, Darwin, and Brisbane. These warning centres monitor all tropical cyclones that form within the Australian region, including any within the areas of responsibility of TCWC Jakarta or TCWC Port Moresby. The next 12 names on the naming list are listed below:

TCWC Jakarta
The tropical cyclone warning centre in Jakarta monitors tropical cyclones from the Equator to 11°S and between the longitudes 90°E and 145°E. Should a tropical depression reach tropical cyclone strength within TCWC Jakarta's area of responsibility, it will be assigned the next name from the following list:


 * Lili

TCWC Port Moresby
Tropical cyclones that develop between the Equator and 11°S, between 151°E and 160°E, are assigned names by the tropical cyclone warning centre in Port Moresby, Papua New Guinea. Tropical cyclone formation in this area is rare, with no cyclones being named in it since 2007. As names are assigned in a random order the whole list is shown below:

Oma re-entered the basin from the Coral Sea on 21 February, as a Category 2 tropical cyclone; its name was assigned by the Fiji Meteorological Service (FMS), while it was still in the South Pacific basin.