During each tropical cyclone year, Australia's Bureau of Meteorology National Climate Centre (BoM), the Guy Carpenter Asia-Pacific Climate Impact Centre, New Zealand's National Institute of Water and Atmospheric Research (NIWA) and partners issue seasonal forecasts for the Australian region and its various subregions.

[11] Over the next few days, the low moved towards the southeast, while the system's low-level circulation centre gradually developed further, in an area of moderate vertical wind shear.

[11] During that day, RSMC La Réunion reported that Alenga reached an initial 10-minute peak windspeed of 100 km/h (60 mph), as it started to recurve and move towards the Australian region.

[11][13] The system then weakened slightly, before re-intensifying and surpassing its initial peak intensity, as it moved back into the Australian region during 7 December.

[14] During the next day, TCWC Perth reported that Alenga had become a Category 3 Severe Tropical Cyclone, and reached its 10-minute peak windspeeds of 150 km/h (95 mph) before the JTWC also reported that Alenga had intensified further and peaked with 1-minute windspeeds of 175 km/h (110 mph), and had become equivalent to a category 3 severe tropical cyclone, on the SSHWS.

[11][14] Alenga then started to rapidly weaken as it moved into an area of higher vertical wind shear, with convection diminishing and the low-level circulation centre becoming elongated.

[16] On 18 December, TCWC Brisbane reported that a tropical low had developed within the South Pacific convergence zone, to the southeast of Port Moresby, in Papua New Guinea.

Over the next few days Cyclone Fina developed storm force winds and produced dangerous surfing conditions in southeast Queensland over the Christmas holiday.

[25] The system crossed Van Diemen Gulf and made a second landfall east of Point Stuart in the early morning of 26 December.

The system continued to move eastward across the Cape York Peninsula and into the Coral Sea, even as the storm weakened, until Grant underwent an extratropical transition on 2 January 2012.

Early on 9 January, both the JTWC and TCWC Perth started to monitor a tropical low that had developed within a monsoon trough, about 950 km (590 mi) to the north of Port Hedland in Western Australia.

[29][30] Over the next two days, the low gradually moved southwards and developed in favourable conditions into a tropical cyclone, before late on 10 January, it was assigned the designation 06S by the JTWC and named Heidi by TCWC Perth.

[37] On 13 January, the remnants of Heidi continued to move south through the Gascoyne region with widespread rainfall totals of up to 30 mm (1.2 in).

[43]On 21 January, JTWC reported that an area of convection with a weak low level circulation had developed about 480 kilometres (300 mi) from Port Hedland.

[44] By 24 January, TCWC Perth reported that a tropical low had formed, and that it was 720 kilometres (445 mi) north northwest of Exmouth moving west at 23 km/h (14 mph).

[46] During its formative stages, Iggy was responsible for triggering severe weather, including tornadoes and flooding in Java, Bali, and in Lombok, Indonesia, causing the deaths of at least 16 people, and the destruction of thousands of houses.

[48] Early on 27 January, the system was upgraded to a Category 2 cyclone, while located 610 kilometres (380 mi) northwest of Exmouth moving east southeast.

A Severe Weather Warning for damaging winds and heavy rain was issued for the area bound by Kalbarri, Morawa, Wongan Hills, Narrogin and Harvey including Geraldton, Perth (the first ex-tropical cyclone to affect the region since Bianca) and Mandurah.

[55] Dry air and wind shear prevented the system from strengthening significantly, but a moisture field over the Australian continent helped the storm maintain its intensity.

Heavy rainfall from Jasmine's outer rainbands produced large precipitation totals across southern areas of Queensland.

Lua became a category 3 severe tropical cyclone on 16 March, and it made landfall near Pardoo the next day, with sustained winds of 155 km/h (95 mph).

On 14 March, Tropical Low 17U slowly began to weaken as the storm made landfall on the northeastern border of Western Australia.

Late on 21 March, 17U began emerging off the eastern coast of Queensland, as it was drawn towards a powerful extratropical cyclone, to the east.

On 5 May, the JTWC reported that a tropical disturbance had developed within the Banda Sea, about 425 km (265 mi) to the northeast of Dili, on Timor island.

[69] On 7 May, TCWC Jakarta and the JTWC reported that the disturbance strengthened into a tropical depression, off the Indonesian east coast, and gave the storm the identifier 19S.

Early on 14 May, Tropical Depression 19S passed to the east of Sumba and impacted Flores, as the storm continued to move northwestwards.

Later on the same day, TCWC Jakarta and the BoM both issued their last advisories on Tropical Depression 19S, as the storm dissipated just north of Flores.

On 26 December, TCWC Perth reported that a tropical low had developed near the Western boundary of the region, located over in moderate vertical wind shear.

[73] On 5 January, TCWC Darwin had spotted a weak tropical low, formed from the monsoon trough over to the north of Timor, however this was the only known advisory for that system.

[77] During the season a total of 7 tropical cyclones received a name from BoM, either by TCWC Perth, Darwin, or Brisbane, when the system was judged to have 10-minute sustained windspeeds of 65 km/h (40 mph).