2011–12 Australian region cyclone season

Seasonal forecasts

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. Since a tropical cyclone can move through a region, the actual number of tropical cyclones in a region include any that form in or move into a region from another.

Bureau of Meteorology

In October 2011, ahead of the tropical cyclone season starting on 1 November, the BoM issued seasonal forecasts for the whole Australian region, one for each of the subregions Western, North-Western, Northern and Eastern Australia with each one covering the whole tropical cyclone year. For each forecast they took into account, the current neutral ENSO conditions to weak La Niña conditions that had been observed during that summer. For the whole region they predicted that there was an 80% chance that the season would be above average.

For the Western region between 90°E and 125°E, the BoM forecast that the area would see activity near to or slightly above the average, with a 35% chance of a below average cyclone activity. For the North-Western subregion between 105°E and 130°E, it was predicted that there was a 60% chance of above average tropical cyclone activity, while TCWC Perth noted that there was a likelihood of two tropical cyclones and one severe tropical cyclone impacting Western Australia. The Northern Territory which was defined as being between as being 125°E and 142.5°E had a 60% chance of being above average, while the Eastern region had a 65% chance of having an above average tropical cyclone season. During February, after Cyclones Heidi and Iggy had threatened Western Australia, it was reported that there was a likelihood of at least one more coastal impact and a significant risk that it could be a severe tropical cyclone. The BoM also issued a seasonal forecasts for the South Pacific region between 142.5°E and 165°E and one for the Eastern Southern Pacific region between 165°E and 120°W. The outlook called for a westward shift in tropical cyclone activity with a 65% chance that the Western Pacific Region will see more than the average number of tropical cyclones while there was a 40% chance that the Eastern Pacific Region will see above average number.

Others===<!--

During October 2012, the New Zealand National Institute of Water and Atmospheric Research (NIWA) and its partners issued a tropical cyclone outlook, for the South Pacific region between 135°E and 120°W. The outlook predicted that the region would see a near average or slightly above average amount of tropical cyclones with between 9 and 12 systems predicted to develop or move into the region. NIWA also predicted that countries west of the International Date Line, including Papua New Guinea, the Solomon Islands, Vanuatu, New Caledonia and Fiji were likely to experience an average to slightly above normal risk of a tropical cyclone.

During December 2012, the Guy Carpenter Asia-Pacific Climate Impact Centre (GCACIC), issued a seasonal forecast for the whole basin and one each for the regions to the east and west of 135°E. This season the GCACIC predicted that tropical cyclone activity in the entire Australian region and the western Australian region was likely to be near-normal and predicted 12 and 9 tropical cyclone respectively. For the eastern Australian region, the GCAIC predicted that tropical cyclone activity would be below average and only predicted 4 tropical cyclones to develop. --

Seasonal summary

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PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:03/12/2011 till:04/12/2011 color:TL text: barset:break from:07/12/2011 till:11/12/2011 color:C3 text:"Alenga (C3)" from:20/12/2011 till:25/12/2011 color:C1 text:"Fina (SC)" from:21/12/2011 till:28/12/2011 color:TL text:"Benilde (TL)" from:21/12/2011 till:02/01/2012 color:C2 text:"Grant (C2)" from:26/12/2011 till:28/12/2011 color:TL text:"05U (TL)" from:05/01/2012 till:05/01/2012 color:TL text:"06U (TL)" from:09/01/2012 till:13/01/2012 color:C3 text:"Heidi (C3)" barset:break from:13/01/2012 till:13/01/2012 color:TL text:"08U (TL)" from:21/01/2012 till:21/01/2012 color:TL text:"09U (TL)" from:21/01/2012 till:27/01/2012 color:TL text:"10U (TL)" from:22/01/2012 till:03/02/2012 color:C2 text:"Iggy (C2)" from:01/02/2012 till:06/02/2012 color:C2 text:"Jasmine (C2)" from:09/02/2012 till:14/02/2012 color:TL text:"Hilwa (TL)" from:05/03/2012 till:07/03/2012 color:TL text:"14U (TL)" barset:break from:05/03/2012 till:08/03/2012 color:C2 text:"Koji (C2)" from:09/03/2012 till:18/03/2012 color:C3 text:"Lua (C3)" from:11/03/2012 till:21/03/2012 color:TL text:"17U (TL)" from:29/03/2012 till:31/03/2012 color:TL text:"Daphne (TL)" from:16/04/2012 till:23/04/2012 color:TL text:"19U (TL)" from:07/05/2012 till:14/05/2012 color:TL text:"19S (TL)" from:27/06/2012 till:01/07/2012 color:C1 text:"21U (C1)" bar:Month width:6 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/12/2011 till:31/12/2011 text:December from:01/01/2012 till:31/01/2012 text:January from:01/02/2012 till:29/02/2012 text:February from:01/03/2012 till:31/03/2012 text:March from:01/04/2012 till:30/04/2012 text:April from:01/05/2012 till:31/05/2012 text:May from:01/06/2012 till:30/06/2012 text:June from:01/07/2012 till:31/07/2012 text:July TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)"

Systems

Severe Tropical Cyclone Alenga

(out of basin 4–7 December) |10-min winds=75 |1-min winds=95 On 3 December, TCWC Perth and TCWC Jakarta started monitoring a tropical low that had developed about 1220 km (760 mi) to the southwest of Jakarta, Indonesia. 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. During the next day, the low moved out of the Australian region and moved into the South-West Indian Ocean, where it was named Alenga by the Mauritius Meteorological Service on 5 December. During that day, RSMC La Réunion reported that Alenga reached an initial 10-minute peak windspeed of 100 km/h, as it started to recurve and move towards the Australian region. 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. Later that day, the JTWC reported that Alenga had become equivalent to a category one hurricane on the Saffir–Simpson hurricane scale (SSHS). 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 before the JTWC also reported that Alenga had intensified further and peaked with 1-minute windspeeds of 175 km/h, and had become equivalent to a category 3 severe tropical cyclone, on the SSHWS. 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. On 9 December, TCWC Perth reported that Alenga had degenerated into a tropical low, while the JTWC followed suit and issued their final advisory on Alenga. TCWC Perth then tracked the remnants for another three days, in their tropical weather outlooks, before dropping it on 12 December. Alenga brought severe storms to Perth on 12 and 13 December.

Subtropical Cyclone Fina

|10-min winds=45 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, the low moved towards the south-southwest under the influence of a weak upper ridge of high pressure in an area of weak vertical wind shear. On 20 December, as convection had consolidated over the systems low level circulation centre, the JTWC issued a Tropical Cyclone Formation Alert on the system. During the next day TCWC Brisbane reported that the low had become a category one tropical cyclone and named it Fina during the next day as it had 10-minute windspeeds of 65 km/h. However, as soon as Fina was named, it started weakening as an upper-level trough of low pressure moving through eastern Australia, increased windshear over the system, which meant that Fina's low level circulation centre became exposed, with convection displaced over 135 km from the centre. As a result of this, the JTWC decided to cancel their Tropical Cyclone Formation Alert late on 22 December, while TCWC Brisbane reported that Fina had degenerated into an extratropical cyclone. Over the next few days Cyclone Fina developed storm force winds and produced dangerous surfing conditions in southeast Queensland over the Christmas holiday. In post-analysis in early 2012, the BoM downgraded Fina to a tropical low.

Tropical Low 03U (Benilde)

|1-min winds=30 On 21 December, TCWC Perth reported within their tropical weather outlooks that a tropical low was developing about 770 km (410 mi) to the northeast of the West Island of the Cocos (Keeling) Islands. Over the next few days they continued to monitor it, as the system slowly moved west-southwestward. On 28 December it moved into RSMC La Réunion's area of responsibility, where it commenced a strengthening trend.

Tropical Cyclone Grant

Main article: Cyclone Grant

|10-min winds=60 |1-min winds=60 An area of thunderstorms north-northeast of Darwin was designated Tropical Low 04U by TCWC Darwin on 21 December. Tropical Low 04U developed into a Category 1 tropical cyclone on the morning of 25 December, and reached Category 2 strength in the afternoon of 25 December. A cyclone watch was declared between Dundee Beach and Nhulunbuy, whilst a cyclone warning was issued for areas between Cape Fourcroy and Milingimbi including the Tiwi Islands. A gale warning had been issued for Darwin and the Tiwi Islands on 24 December.

Upon intensification to Category 1 on 25 December the cyclone was moving slowly towards the Cobourg Peninsula. The system intensified further on 25 December, reaching Category 2 status in the afternoon. The system crossed Van Diemen Gulf and made a second landfall east of Point Stuart in the early morning of 26 December. Shortly thereafter the cyclone was downgraded to Category 1 and by the afternoon of that day it was downgraded to an ex-tropical low.

On 28 December in the evening, the system moved back onto the waters of the Gulf of Carpentaria, and was downgraded to a tropical low. 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. Later on the same day, the extratropical remnant of Grant dissipated.

Severe Tropical Cyclone Heidi

|10-min winds=80 |1-min winds=65 Main article: Cyclone Heidi

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. 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.

In preparation for the cyclone Port Hedland Port Authority closed the port, oilfields and gas production off the North-West coast were halted, and flights from Perth to Port Hedland were cancelled.

In the early morning of 12 January the system made landfall just east of Port Hedland and after a few hours the system was downgraded to Category 1 cyclone. Port Hedland received 128.0 mm of rain by 9:00 am with gusts of 131 km/h and Wallal Downs recording 166.0 mm of rain. More than 3,500 homes and businesses in Port Hedland were left without power. Late on 12 January the system was downgraded to a tropical low about 45 km northeast of Tom Price. Flood Warnings continued for the Ashburton and De Grey River areas. On 13 January, the remnants of Heidi continued to move south through the Gascoyne region with widespread rainfall totals of up to 30 mm. Significant rainfall was recorded in the Gascoyne region through early morning 14 January at the homestead of Mount Vernon with 117.0 mm of rain and Tangadee with 74.0 mm of rain. In the early morning of 15 January a severe weather warning was cancelled for northeast Gascoyne. However showers from the remnants of the tropical low still persisted.

Ahead of Cyclone Heidi making landfall during 12 January, various tropical cyclone alerts and warnings were issued for parts of the Pilbara Coast between Wallal and Dampier.

Track data subsequently released by the BoM indicated that Heidi's winds were equivalent to a Category 3 system.

Tropical Low 10U

On 22 January, a tropical low formed in a monsoonal trough over the Arafura Sea. The low then slowly moved to the south and west over the next few days as gale-force westerly winds developed to the north. This storm made 2 landfalls. The first one was on 24 January around 10:00 am when the storm made landfall over Melville Island. Later that night, the storm made its final landfall in the late afternoon hours of 24 January.

This storm brought heavy rain and strong winds to Darwin. This led to the temporary closure of the Territory Wildlife Park and the George Brown Botanic Gardens on 26 January. Flights out of Darwin International Airport had delays and cancellations. Coastal regions around Darwin also experienced significant beach erosion.

Tropical Cyclone Iggy

|10-min winds=60 |1-min winds=70 On 21 January, JTWC reported that an area of convection with a weak low level circulation had developed about 480 km from Port Hedland. By 24 January, TCWC Perth reported that a tropical low had formed, and that it was 720 km north northwest of Exmouth moving west at 23 km/h. The tropical low was then given the identification 11U. Late on 25 January, the JTWC upgraded it into a tropical depression and designated as 09S. Soon after the system strengthened and the TCWC Perth had named the system Tropical Cyclone Iggy. The system was located 960 km northwest of Exmouth, moving west at 5 km/h.

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.

Early on 26 January, the system began to recurve and headed slowly towards the Pilbara coast. Early on 27 January, the system was upgraded to a Category 2 cyclone, while located 610 km northwest of Exmouth moving east southeast. By late 27 January a cyclone warning had been issued from Mardie to Ningaloo. On 28 January, Iggy reached its peak intensity, with a minimum central pressure of 970 mbars. By 29 January, the system became stationary. Wind shear and lower sea surface temperatures, which the cyclone remained stationary over inhibited intensification. Later in the day, the system weakened into a Category 1 cyclone. On 30 January, after regaining forward momentum, the system began moving southwest at 6 km/h, and restrengthened into a Category 2 system. Early on 31 January, the system had once again weakened into a Category 1 cyclone, only to reintensify into a Category 2 cyclone on 1 February.

Iggy eventually lost cyclone strength on 2 February, as it made landfall near Jurien Bay. 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. The town of Lancelin received 98.0 mm of rain. On 3 February, Iggy dissipated inland.

Tropical Cyclone Jasmine

Main article: Cyclone Jasmine

|10-min winds=60 |1-min winds=60 Severe Tropical Cyclone Jasmine was a long–lived annular tropical cyclone that affected several countries, particularly Vanuatu and Tonga, over a 19-day span. The sixth cyclone of the season, Cyclone Jasmine developed from an area of disturbed weather on 1 February in the Gulf of Carpentaria. Initially, the storm moved towards the east and across the Cape York Peninsula. 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. Wind shear would later be subdued, allowing Jasmine to strengthen quicker. On 5 February, Jasmine reached its peak intensity in the Australian basin as a Category 2 on the Australian tropical cyclone intensity scale, with 10-minute sustained winds of 95 m/h (60 mph). After moving to the southeast in response to a nearby subtropical ridge, Jasmine exited the BOM's area of responsibility on 6 February.

In Queensland, Jasmine produced heavy rains and gusty winds. Heavy rainfall from Jasmine's outer rainbands produced large precipitation totals across southern areas of Queensland. After moving into the Coral Sea, a surface trough attached to the system produced more rain showers over Australia. In Cairns, Queensland, several roads were closed and trees were uprooted by strong winds associated with Jasmine. In addition, power lines that were knocked down in the city's northern suburbs caused power outages for affected areas.

Tropical Low 13U (Hilwa)

|10-min winds= |1-min winds=35 On 5 February, TCWC Perth reported within their tropical weather outlooks that a tropical low was developing near 12°S 95°E, 200 km (120 mi) to the west of the West Island of the Cocos (Keeling) Islands. Over the next few days, TCWC Perth continued to monitor the storm, as it slowly moved westward. TCWC Perth predicted it would move west of 90°E without developing into a Tropical Cyclone. On 14 February, JTWC classified the storm as Tropical Cyclone 13S, as the storm moved out of the BoM's area of responsibility, and into the South-West Indian Ocean basin.

Tropical Cyclone Koji–Joni

|10-min winds=50 |1-min winds=45 On 6 March, an area of thunderstorms that TCWC Perth had been watching since 3 March, became a tropical low. Later on the same day, the BoM designated the storm as Tropical Low 15U while the JTWC designated the storm as Tropical Cyclone 16S. On the morning of 8 March, the low strengthened into a Category 1 tropical cyclone, assigning the name Koji. However, a few hours later, Koji moved west of 90°E and was renamed Joni by the Mauritius Meteorological Service. Despite this, the combined name Koji–Joni was now used on advisories issued on the storm, instead of a "single" name. This would be the last system to be renamed, with Cyclone Bruce in 2013 being the first system to retain its name when it moved west of 90°E.

Severe Tropical Cyclone Lua

Main article: Cyclone Lua

|10-min winds=85 |1-min winds=95 On 8 March, a low-pressure area developed well off the coast of Pilbara. On 9 March, TCWC Perth noted the low had become a tropical low, and then assigned the identification 16U. On 13 March, both the BoM and the JTWC upgraded the system to a category 1 tropical cyclone and named it Lua. On 14 March, Lua intensified into a category 2 tropical cyclone as it began moving westwards away from Western Australia. 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. Early on 18 March, Lua weakened below tropical cyclone intensity. The remnants of the storm dissipated later on that day, after moving deeper into Western Australia.

Lua is so far the strongest cyclone to impact the Australian coast, since Yasi in 2011, and the Pilbara coast, since Laurence in 2009. Lua is also notable for maintaining cyclone strength as far south as Wiluna, making it the closest a cyclone has approached the Goldfields–Esperance region, since Steve in 2000. The city of Kalgoorlie received 59.4 mm of rainfall from the system, its heaviest rainfall in 12 years, while Norseman received 60 mm.

Tropical Low 17U

|10-min winds=30 On 9 March, an area of low pressure developed to the north of Kimberley. Over the next 3 days, the low moved into the Timor Sea, as the storm slowly intensified. On 12 March, TCWC Darwin reported that the storm had intensified into a tropical low and gave it the identification 17U. As the storm approached the northern coast of Western Australia, it continued to intensify slowly. On 14 March, Tropical Low 17U slowly began to weaken as the storm made landfall on the northeastern border of Western Australia. Several hours later, 17U made a second landfall over the northwestern border of the Northern Territory. Afterwards, TCWC Darwin issued their last bulletin on the storm as it degenerated into a weak low. During the next several hours, 17U continued moving eastwards deep into the Northern Territory while maintaining its intensity. However, TCWC Darwin continued to track 17U on their 3-Day Outlook, until the storm entered TCWC Brisbane's area of responsibility, on 16 March. Late on 15 March, 17U crossed over into Northern Queensland with the northern part of the storm emerging into the southern part of the Gulf of Carpentaria. Soon afterwards, 17U began to reintensify. Late on 17 March, 17U began to stall in the southeastern Gulf of Carpentaria. Late on 18 March, TWCW Brisbane issued their last advisory on the storm, as it was not expected to become a tropical cyclone, at this point. However, the agency continued to track the storm on their outlook, until the storm's dissipation. Late on 19 March, Tropical Low 17U began moving southward, deeper into Queensland. Early on 20 March, wind shear began weakening the storm, as it turned eastward. 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. By 22 March, the extratropical storm had absorbed Tropical Low 17U, and thus the storm was dropped from TCWC Brisbane's outlook.

Tropical Low 18U (Daphne)

Tropical Low 19U

Tropical Depression 19S

|10-min winds=30 |1-min winds=30 Main article: List of off-season Australian region tropical cyclones

On 5 May, the JTWC reported that a tropical disturbance had developed within the Banda Sea, about 265 mi to the northeast of Dili, on Timor island. 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. Soon afterwards, the storm reached its peak intensity, with a central low pressure of 996 mbars. Late on 7 May, vertical wind shear from the north caused the system's northern convection to dissipate, as the storm turned to the southeast, prompting the JTWC to issue their last advisory on the system. However, on 8 May, the wind shear weakened, and the system regained its convection, as it began to reorganize. Later on the same day, 19S turned to the south-southwest and narrowly passed in between a few Indonesia islands. On 10 May, 19S turned to the southwest, as it approached Timor. On 11 May, Tropical Depression 19S turned westward, as it slightly organized. Early on 11 May, Tropical Depression 19S impacted southwestern Timor and stalled there for 2 days, while beginning to weaken. On 12 May, Tropical Depression 19S began to weaken more rapidly, as it turned to the northwest. 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.

Tropical Cyclone 21U

|10-min winds=45 |1-min winds=35 Main article: List of off-season Australian region tropical cyclones

This system was one of the few storms to form out of season.

Other systems

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. The tropical low slowly moved in a westward direction and the JTWC issued a TCFA; although TCWC Perth issued its final advisory on the tropical low on 28 December. 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. Two tropical lows also developed during January, but those storms remained extremely weak. On 3 March, TCWC Brisbane had reported a slow-moving low over in the central Coral Sea. The low lingered for a few days and on 6 March, the JTWC upgraded it to a medium chance of becoming a tropical cyclone, and was reported that the low was having some subtropical characteristics. TCWC Brisbane made its final advisory on the low on 7 March, as it became a remnant low.

Storm names

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. There has only been one list that the Bureau of Meteorology have assigned names to tropical cyclones since the 2008–09 season. Tropical cyclones named by the TCWC Jakarta and Port Moresby are rare, with the last named cyclones occurring during 2010 and 2007, respectively.

Retirement

The Bureau of Meteorology retired the names Heidi, Jasmine and Lua, replacing them with Hayley, Jenna and Luana respectively.

Season effects

|- | Alenga || 3–11 December || bgcolor=#| || bgcolor=#| || bgcolor=#| || None || || || |- | Fina || 20–25 December || bgcolor=#| || bgcolor=#| || bgcolor=#| || Papua New Guinea || || |- | 03U (Benilde) || 21–28 December || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#|Not specified || None || || |- | Grant || || bgcolor=#| || bgcolor=#|60 kn || bgcolor=#|976 hPa || Northern Territory, Queensland || || || |- | 05U || 26–28 December || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#|Not specified || None || || |- | 06U || 5 January || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#|Not specified || Timor || || |- | Heidi || 9–13 January || bgcolor=#| || bgcolor=#|80 kn || bgcolor=#| || Western Australia || Minor || None || |- | 08U || 13 January || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#|Not specified || None || || |- | 09U || 21 January || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#|Not specified || None || || |- | 10U || 22–29 January || bgcolor=#| || bgcolor=#| || bgcolor=#| || Northern Territory, Queensland || Minor || |- | Iggy || 22 January – 3 February || bgcolor=#| || bgcolor=#|55 kn || bgcolor=#|974 hPa || Western Australia || || || |- | Jasmine || || bgcolor=#| || bgcolor=#|60 kn || bgcolor=#|976 hPa || Queensland, New Caledonia, Vanuatu, Tonga || || || |- | 13U (Hilwa) || 5–14 February || bgcolor=#| || bgcolor=#|Not specified || bgcolor=#| || Christmas Island, Cocos Islands || || |- | 14U || 3–7 March || bgcolor=#| || bgcolor=#| || bgcolor=#| || Western Australia || || |- | Koji-Joni || 5–8 March || bgcolor=#| || bgcolor=#|50 kn || bgcolor=#|985 hPa || None || || || |- | Lua || 9–18 March || bgcolor=#|Category 3 severe tropical cyclone || bgcolor=#|85 kn || bgcolor=#|935 hPa || Western Australia || || || |- | 17U || || bgcolor=#| || bgcolor=#|30 kn || bgcolor=#|993 hPa || Western Australia, Northern Territory, Queensland || None || None || |- | 18U (Daphne) || 29–31 March || bgcolor=#| || bgcolor=#| || bgcolor=#| || None || || |- | 19U || 16–25 April || bgcolor=#| || bgcolor=#| || bgcolor=#| || Papua New Guinea, Northern Territory, Queensland, Indonesia, East Timor || None || None || |- | 19S || 7–14 May || bgcolor=#| || bgcolor=#| || bgcolor=#| || Indonesia, East Timor || None || None || |- | 21U || || bgcolor=#| || bgcolor=#|45 kn || bgcolor=#|994 hPa || Papua New Guinea || Unknown || None || |-

References

References

1. Saunders, Mark. (11 May 2011). "Extended Range Forecast for Australian-Region Tropical Storm Activity in 2011/12". Tropical Storm Risk Consortium.
2. Saunders, Mark. (7 December 2011). "December Forecast Update for Australian-Region Tropical Storm Activity in 2011/12". Tropical Storm Risk Consortium.
3. Saunders, Mark. (4 July 2011). "July Forecast Update for Australian-Region Tropical Storm Activity in 2011/12". Tropical Storm Risk Consortium.
4. Saunders, Mark. (8 September 2011). "September Forecast Update for Australian-Region Tropical Storm Activity in 2011/12". Tropical Storm Risk Consortium.
5. Saunders, Mark. (8 November 2011). "November Forecast Update for Australian-Region Tropical Storm Activity in 2011/12". Tropical Storm Risk Consortium.
6. National Climate Centre. (15 October 2012). "2011–2012 Australian Tropical Cyclone Season Outlook". Australian Bureau of Meteorology.
7. Western Australia Regional Office. (17 October 2011). "Communities in WA's north-west urged to prepare now". Australian Bureau of Meteorology.
8. Western Australia Regional Office. (10 February 2012). "Updated tropical cyclone outlook – communities urged to stay prepared". Australian Bureau of Meteorology.
9. National Climate Centre. (15 October 2011). "2011–2012 South Pacific Tropical Cyclone Season Outlook". Australian Bureau of Meteorology.
10. (18 October 2012). "Southwest Pacific Tropical Cyclone Outlook: Near average or slightly above average numbers for many islands likely, and increased activity in the late season near Tonga and Niue". National Institute of Water & Atmospheric Research.
11. Western Australian Regional Office (Perth Tropical Cyclone Warning Center). (14 December 2011). "Severe Tropical Cyclone Alenga". Bureau of Meteorology.
12. Joint Typhoon Warning Center. "Tropical Cyclone Formation Alert 2011-12-03 2030z". United States Navy, United States Airforce.
13. RSMC La Réunion Tropical Cyclone Center. (5 December 2011). "Tropical Cyclone Forecast Warning 2011-12-05 06z". Météo-France.
14. Joint Typhoon Warning Center. (7 December 2011). "Running best track: Tropical Cyclone 01S (Alenga)". United States Naval Research Laboratory.
15. Perth Tropical Cyclone Warning Center. "Tropical Cyclone Technical Bulletin 2011-12-08 12z". Bureau of Meteorology.
16. Perth Tropical Cyclone Warning Center. (22 December 2011). "Tropical Cyclone three-day outlooks for the Western Region 8–12 December 2011". Bureau of Meteorology.
17. Brisbane Tropical Cyclone Warning Center. (7 January 2012). "Tropical Cyclone Fina". Bureau of Meteorology.
18. Joint Typhoon Warning Center. "Significant tropical weather advisory for the Western and Southern Pacific Ocean 2011-12-19". United States Navy, United States Airforce.
19. Brisbane Tropical Cyclone Warning Center. (21 December 2011). "Tropical Cyclone Technical Bulletin for Tropical Cyclone Fina 2011-12-21 18:00 UTC". Australian Bureau of Meteorology.
20. Brisbane Tropical Cyclone Warning Center. "Tropical Cyclone Fina". Bureau of Meteorology.
21. "Tropical Cyclone Technical Bulletin for Tropical Low 04U". Tropical Cyclone Warning Centre, Darwin.
22. (25 December 2011). "TC Track". [[Bureau of Meteorology.
23. "Weather News – Cyclone moves on after whipping remote island".
24. "Weather News – Nervous wait as NT cyclone picks its path".
25. Partenza, Nathan. (24 December 2011). "Darwin braces itself on Tracy anniversary as threat of holiday cyclone increases". [[The Age]].
26. Peddie, Clair. (25 December 2011). "Top End bunkers down for cyclone". [[The Advertiser (Adelaide).
27. (26 December 2011). "Cyclone updates: Boxing Day". [[Northern Territory News.
28. Bevege, Allison. (26 December 2011). "Cyclone Grant is officially dead". [[Northern Territory News.
29. "TROPICAL CYCLONE ADVICE NUMBER 39 (04U)". Tropical Cyclone Warning Centre, Darwin.
30. Joint Typhoon Warning Center. "Significant Tropical Weather Advisory for the Indian Ocean 2012-01-09 14z". United States Navy, United States Air Force.
31. Western Australian Regional Office (Perth Tropical Cyclone Warning Center). "Tropical Cyclone Heidi Impacts". Bureau of Meteorology.
32. Joint Typhoon Warning Center. "Tropical Cyclone 06S (Heidi) Warning 1 2012-01-10 21z". United States Navy, United States Air Force.
33. Evans, Nick. (11 January 2012). "Cyclone Heidi shuts down Port Hedland port, mines and cancels flights".
34. Unattributed. (12 January 2012). "Tropical Cyclone Technical Bulletin for Tropical Cyclone Heidi 2012-01-12 4:52 am WST (Advice #21)". Bureau of Meteorology.
35. Unattributed. (12 January 2012). "Tropical Cyclone Technical Bulletin for Tropical Cyclone Heidi 2012-01-12 9:08 am WST (Advice #25)". Bureau of Meteorology.
36. (11 January 2012). "Cyclone Heidi crosses Pilbara coast, residents on red alert".
37. "Weather News – Clean-up begins in the wake of Cyclone Heidi".
38. Unattributed. (13 January 2012). "Tropical Cyclone Technical Bulletin for Tropical Cyclone Heidi 2012-01-12 11:11 pm WST (Advice #33)". Bureau of Meteorology.
39. Domensino, Ben. (12 January 2012). "Ex-Tropical Cyclone Heidi heads south".
40. (13 January 2012). "Western Australia Flood Warning for the Ashburton River Catchment – Issued at 9:51 am WST". Townsville Bulletin.
41. (15 January 2012). "Western Australia CANCELLATION of SEVERE WEATHER WARNING – Issued at 3:35 am WST". [[Townsville Bulletin]].
42. WA Tropical Cyclone Warning Center (Perth Tropical Cyclone Warning Center). "Tropical Cyclone Advice Number 1 2012-01-10 3:19 pm WST". Bureau of Meteorology.
43. (September 2016). "Severe Tropical Cyclone Heidi 9 – 13 January 2012". Australian Government Bureau of Meteorology.
44. "Tropical Low (10U) 22-26 January 2012".
45. Unattributed. (24 January 2012). "SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE INDIAN OCEAN, JTWC". JTWC.
46. Unattributed. (24 January 2012). "TROPICAL CYCLONE INFORMATION BULLETIN Issued at 8:51 pm WST on Tuesday 24 January 2012". Bureau of Meteorology.
47. Unattributed. (25 January 2012). "TROPICAL CYCLONE INFORMATION BULLETIN 3:03 am WST on Thursday 26 January 2012". Bureau of Meteorology.
48. Unattributed. (27 January 2012). "Tropical Cyclone Iggy Triggers Indonesian Tornadoes".
49. Unattributed. (26 January 2012). "TROPICAL CYCLONE ADVICE NUMBER 1 Issued at 10:55 am WST on Thursday, 26 January 2012". Bureau of Meteorology.
50. Unattributed. (27 January 2012). "TROPICAL CYCLONE ADVICE NUMBER 5 Issued at 8:37 am WST on Friday 27 January 2012". Bureau of Meteorology.
51. Unattributed. (27 January 2012). "TROPICAL CYCLONE ADVICE NUMBER 8 Issued at 11:34 pm WST on Friday 27 January 2012". Bureau of Meteorology.
52. Unattributed. (29 January 2012). "TROPICAL CYCLONE Technical Bulletin at: 1307 UTC 29/01/2012". Bureau of Meteorology.
53. Unattributed. (30 January 2012). "TROPICAL CYCLONE INFORMATION BULLETIN Issued at 8:55 pm WST on Monday 30 January 2012". Bureau of Meteorology.
54. Unattributed. (31 January 2012). "Tropical Cyclone Technical Bulletin Issued by PERTH TROPICAL CYCLONE WARNING CENTRE at: 0107 UTC 31/01/2012". Bureau of Meteorology.
55. (27 January 2012). "Wet Iggy dumps heavy overnight rain – Lancelin gets 100mm". [[Perth Now]].
56. Queensland Regional Office/Brisbane tropical cyclone warning centre. "Tropical Cyclone Jasmine Impacts". Australian Bureau of Meteorology.
57. Joint Typhoon Warning Center. "Tropical Cyclone Jasmine". Australian Severe Weather.
58. Queensland Regional Office. (2012). "Tropical Cyclone Jasmine". [[Bureau of Meteorology]].
59. Queensland Climate Services Centre. (2012). "February 2012". Australian Bureau of Meteorology.
60. (4 February 2012). "Severe weather warning as strong winds hit tropical coast and Tablelands". [[The Cairns Post]].
61. Nancarrow, Christy. (6 February 2012). "Cyclone Jasmine moves away from Qld coast". Australian Broadcasting Corporation.
62. "The International Molecular Exchange Consortium (IMEx)".
63. "The International Molecular Exchange Consortium (IMEx)".
64. "TROPICAL CYCLONE FORECAST TRACK MAP – Tropical Cyclone Koji". BoM.
65. Dutschke, Brett. (19 March 2012). "Old Lua soaks southern WA". Weatherzone.
66. Bennett, Cortlan. "Dying Lua dumps heavy rain in Goldfields after lashing Pilbara coast". PerthNow.
67. "". link
68. "". link
69. (14 March 2012). "TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - NORTHERN REGION".
70. Joint Typhoon Warning Center. "Significant tropical weather advisory for the Indian Ocean 2012-05-05 06z". United States Navy, United States Airforce.
71. (26 December 2011). "Tropical Cyclone three-day outlook for the Western Region". Australian Bureau of Meteorology.
72. "Joint Typhoon WRNCEN Pearl Harbor HI//SUBJ/Significant Tropical Weather Advisory for the Indian/Ocean".
73. "Pearl Harbor HI//SUBJ/Tropical Cyclone Formation Alert".
74. (28 December 2011). "Tropical Cyclone three-day outlook for the Western Region". Australian Bureau of Meteorology.
75. (5 January 2012). "Tropical Cyclone three-day outlook for the Western Region". Australian Bureau of Meteorology.
76. (3 March 2012). "Tropical Cyclone three-day outlook for the Western Region". Australian Bureau of Meteorology.
77. "Pearl Harbor HI/JTWC//SUBJ/Significant Tropical Weather Advisory for the Western and/South Pacific Oceans".
78. (7 March 2012). "HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE AUSTRALIAN BUREAU OF METEOROLOGY".
79. ["2012 Tropical Cyclone Jasmine (2012032S15141)"]({{IBTRACS url). International Best Track Archive for Climate Stewardship.
80. (31 January 2012). "Indonesia cleaning up in wake of Cyclone Iggy".
81. Paterson, Linda A. (16 February 2017). "Tropical Cyclone Iggy". Australian Bureau of Meteorology.
82. Baillard, Nadine. (11 June 2015). "Tropical Cyclone Koji". Australian Bureau of Meteorology.
83. "Severe Tropical Cyclone Lua Impacts". Australian Bureau of Meteorology.
84. (4 April 2012). "March 2012 Global Catastrophe Recap". AON Benfield.
85. Courtney, Joseph B. (24 October 2024). "Unnamed Tropical Cyclone 21U". Australian Bureau of Meteorology.