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2011–12 Australian region cyclone season

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2011–12 Australian region cyclone season

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2011–12 Australian region cyclone season
Season summary map
First storm formed 3 December 2011
Last storm dissipated 14 May 2012
Strongest storm Lua – 930 hPa (mbar), 165 km/h (105 mph) (10-minute sustained)
Tropical lows 20
Total storms 8
Tropical cyclones 6
Severe tropical cyclones 2
Total fatalities 16
Total damage Unknown
Australian region cyclone seasons
2009–10, 2010–11, 2011–12, 2012–13, 2013–14,
Related articles

The 2011–12 Australian region cyclone season is an event in the ongoing cycle of tropical cyclone formation. It began on 1 November 2011, and ended on 14 May 2012. The regional tropical cyclone operational plan defines a "tropical cyclone year" separately from a "tropical cyclone season"; the "tropical cyclone year" began on 1 July 2011 and will end on 30 June 2012.[1]

The scope of the Australian region is limited to all areas south of the equator, east of 90°E and west of 160°E. This area includes Australia, Papua New Guinea, western parts of the Solomon Islands, East Timor and southern parts of Indonesia.[1]

Tropical cyclones in this area are monitored by five Tropical Cyclone Warning Centres (TCWCs): the Australian Bureau of Meteorology in Perth, Darwin, and Brisbane; TCWC Jakarta in Indonesia; and TCWC Port Moresby in Papua New Guinea.[1] The Joint Typhoon Warning Center issues unofficial warnings for the region, designating tropical depressions with the "S" suffix when they form west of 135°E, and the "P" suffix when they form east of 135°E.

Contents

Seasonal summary

Cyclone Jasmine Cyclone Grant Tropical cyclone scales#Comparisons across basins

Storms

Severe Tropical Cyclone Alenga

Category 3 severe tropical cyclone (Australian scale)
Category 2 tropical cyclone (SSHS)
Duration 3 December – 11 December
Intensity 150 km/h (90 mph) (10-min),  968 mbar (hPa)

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.[2] 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 windshear.[2][3] 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, during 5 December.[2] During that day, RSMC La Reunion reported that Alenga reached an initial 10-minute peak windspeeds of 100 km/h (65 mph), as it started to recurve and move towards the Australian region.[2][4] 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.[5] Later that day, the JTWC reported that Alenga had become equivalent to a category one hurricane on the Saffir-Simpson Hurricane Scale (SSHS).[5] 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 (90 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.[2][5] Alenga then started to rapidly weaken as it moved into an area of higher vertical windshear, with convection diminishing and the low level circulation centre becoming elongated.[6] On 9 December, TCWC Perth reported that Alenga had degenerated into a tropical low, while the JTWC followed suite and issued their final advisory on Alenga.[6] TCWC Perth then tracked the remnants for another 3 days, in their tropical weather outlooks, before dropping it on 12 December.[7]

Tropical Cyclone Fina

Category 1 tropical cyclone (Australian scale)
Duration 19 December – 23 December
Intensity 65 km/h (40 mph) (10-min),  994 mbar (hPa)

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.[8][9] 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 (40 mph).[10] 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 kilometres (85 mi) from the centre.[8] 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.[8]

Perth Tropical Low (Benilde)

Tropical low (Australian scale)
Duration 21 December – 28 December (out of basin)
Intensity Winds unknown,  Unknown

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
Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHS)
Duration 21 December – 2 January
Intensity 100 km/h (65 mph) (10-min),  978 mbar (hPa)

An area of thunderstorms north-northeast of Darwin was designated Tropical Low 04U by TCWC Darwin on 21 December.[11] Tropical Low 04U developed into a Category 1 tropical cyclone on the morning of 25 December[12][dead link], and reached Category 2 strength in the afternoon of 25 December.[13] A cyclone watch has been declared between Dundee Beach and Nhulunbuy, whilst a cyclone warning was issued for areas between Cape Fourcroy and Milingimbi including the Tiwi Islands.[14] A gale warning had been issued for Darwin and the Tiwi Islands on 24 December.[15]

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.[16] 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[17] and by the afternoon of that day it was downgraded to a ex-tropical low.[18]

On 28 December in the evening, the system moved back onto the waters of the Gulf of Carpentaria,[19] 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.

Tropical Cyclone Heidi

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHS)
Duration 9 January – 13 January
Intensity 110 km/h (70 mph) (10-min),  975 mbar (hPa)

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.[20][21] 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.[21][22]

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.[23]

In the early morning of 12 January the system made landfall just east of Port Hedland[24] and after a few hours the system was downgraded to Category 1 cyclone.[25] Port Hedland received 128.0 mm (5.04 in) of rain by 9:00am with gusts of 131 km/h (81 mph) and Wallal Downs recording 166.0 mm (6.54 in) of rain.[26] More than 3,500 homes and businesses in Port Hedland were left without power.[27] Late on 12 January the system was downgraded to a tropical low about 45 kilometres (30 mi) northeast of Tom Price. Flood Warnings continued for the Ashburton and De Grey River areas.[28] 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).[29] Significant rainfall was recorded in the Gascoyne region through early morning 14 January at the homestead of Mount Vernon with 117.0 mm (4.61 in) of rain and Tangadee with 74.0 mm (2.91 in) of rain.[30] In the early morning of 15 January a severe weather warning was cancelled for northeast Gascoyne. However showers from the remants of the tropical low still persisted.[31]

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.[32]

January Darwin Tropical Low

Tropical low (Australian scale)
Duration 21 January – 29 January
Intensity 55 km/h (35 mph) (10-min),  993 mbar (hPa)

On 24 January the tropical low sat about 120 kilometres (75 mi) north of Maningrida and was moving slowly west south-west.[33] Late in the day a Severe Weather Warning was issued by TCWC Darwin with the tropical low approximately 120 kilometres (75 mi) south southwest of Darwin, moving south southwest at 18 km/h (11 mph)[34] 220.0 mm (8.66 in) of rain has fallen at Stokes Hill, 206.0 mm (8.11 in) at Point Fawcett on the Tiwi Islands and 170.0 mm (6.69 in) at Darwin Airport. Wind gusts to 78 km/h (48 mph) have been reported across the northwest Darwin-Daly and northern Arnhem Districts.[35] The impacts from the tropical low include the Australia Day horse race meeting at Fannie Bay racecourse had been postponed to Saturday, 28 January.[35] Hundreds of people on the outskirts of Darwin were without electricity due to falling braches on power lines.[35] The Severe Weather Warning continued for 26 January as the tropical low was located 60 kilometres (35 mi) east northeast of Katherine. The highest 24 hour rainfall recorded was 195.0 mm (7.68 in) at Channel Point.[36] Through the day the system moved south eastward, bringing with it heavy rainfall to the Roper-McArthur River districts.[37] By early morning on 27 January the system was approximately 50 kilometres (30 mi) southwest of Wollogorang Station.[37] The highest 24 hour rainfall recorded was 287.0 mm (11.30 in) at Mallapunyah on the Tablelands Highway.[37] By late 27 January the system had moved into Queensland and was located near Cloncurry lashing the Gulf Country with heavy rain and strong winds.[38] The tropical low continued to move south southeast and by early 28 January was located near Winton. In a 24 hour period, Gereta Station, north of Mount Isa, recorded 206.0 mm (8.11 in) of rain while Cloncurry received 196.0 mm (7.72 in).[39] Later in the day the low passed west of Charleville and by early 29 January was in the western regions of Warrego.[40] Mid morning on 29 January the low was near Thargomindah and although slowly dissipating, in a 24 hour period still produced noticeable rainfall. Humeburn and Quilpeta received 185.0 mm (7.28 in) and 160.0 mm (6.30 in) of rainfall respectively.[41] The remnants moved into northwestern New South Wales.[41]
The heavy rainfall that fell in Queensland resulted in two major western highways, Landsborough Highway at Winton, north-west of Longreach and the Flinders Highway between Julia Creek and Cloncurry, near Mount Isa were closed due to flooding.[42]

Tropical Cyclone Iggy

Category 2 tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHS)
Duration 22 January – 3 February
Intensity 100 km/h (65 mph) (10-min),  970 mbar (hPa)

On 21 January, JTWC reported that an area convection with a weak low level circulation had developed about 480 kilometres (300 mi) from Port Hedland.[43] By 24 January, TCWC Perth reported that a tropical low had formed, and that it was 720 kilometres (450 mi) north northwest of Exmouth moving west at 23 km/h (14 mph).[44] The tropical low was then given the identification 11U. Late on January 25, 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 kilometres (600 mi) northwest of Exmouth, moving west at 5 km/h (3.1 mph).[45]

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.[46]

Early on January 26, the system began to recurve and headed slowly towards the Pilbara coast.[47] Early on 27 January, the system was upgraded to a Category 2 system, while located 610 kilometres (380 mi) northwest of Exmouth moving east southeast.[48] By late 27 January a cyclone warning had been issued from Mardie to Ningaloo.[49] On January 28, Iggy reached its peak intensity, with a maximum low pressure of 970 mbars. By 29 January, the system became stationary. Wind shear and the cooler water, which the cyclone remained stationary over, upwelled inhibited intensification. Later in the day, the cyclone weakened into a Category 1 cyclone.[50] On 30 January, after regaining forward momentum, the system began moving southwest at 6 km/h (3.7 mph), and restrengthened into a Category 2 system.[51] 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.[52]

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 (3.86 in) of rain.[53] On 3 February, Iggy dissipated inland.

Tropical Cyclone Jasmine

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHS)
Duration 1 February – 6 February (out of basin)
Intensity 100 km/h (65 mph) (10-min),  979 mbar (hPa)
Main article: Cyclone Jasmine

On February 1, TCWC Darwin reported that a tropical low had formed along the Gulf of Carpentaria.[54][55] The storm made landfall on the northern tip of Queensland, on the same day. Later that day, TCWC Darwin issued their final advisory, as the tropical low crossed the Queensland territory.[56] On February 3, the system was located east of Cairns, the BoM and the JTWC issued a TCFA on the tropical low, as it continued to gain strength over the Coral Sea.[57] On February 4, the JTWC upgraded the tropical low into a tropical storm, and designated as 10P, while the BoM designated the storm as Tropical Low 12U.[58] Later that day, the BoM upgraded the system into a Category 1 Tropical cyclone, and named it Jasmine.[59] On 6 February, Tropical Cyclone Jasmine left the Australian region and moved into RSMC Nadi's area of responsibility, where the storm continued to intensify, into a Category 4 severe tropical cyclone.[60]

Perth Tropical Low (Hilwa)

Tropical low (Australian scale)
Tropical storm (SSHS)
Duration 5 February – 14 February (out of basin)
Intensity 75 km/h (45 mph) (1-min),  1000 mbar (hPa)

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

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHS)
Duration 6 March – 8 March (out of basin)
Intensity 95 km/h (60 mph) (10-min),  993 mbar (hPa)

On 6 March, an area of thunderstorms that TCWC Perth had been watching since March 3,[61] became a tropical low.[62] 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.[63] 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.

Severe Tropical Cyclone Lua

Category 4 severe tropical cyclone (Australian scale)
Category 2 tropical cyclone (SSHS)
Duration March 10 – March 18
Intensity 165 km/h (105 mph) (10-min),  930 mbar (hPa)

On March 8, a low-pressure area developed well off the coast of Pilbara. Early on March 10, TCWC Perth noted the low had become a tropical low, and then assigned the identification 16U. On March 13, both the BoM and the JTWC upgraded the system to a category 1 tropical cyclone and named it Lua. On March 14, 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 March 16. Lua intensified into a category 4 severe tropical cyclone early on March 17, and it made landfall near Pardoo later. Early on March 18, Lua weakened below tropical cyclone intensity. The renmants 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.[64] The city of Kalgoorlie received 59.4 mm of rainfall from the system, its heaviest rainfall in 12 years, while Norseman received 60 mm.[65]

Tropical Low 17U

Tropical low (Australian scale)
Duration March 12 – March 22
Intensity 55 km/h (35 mph) (10-min),  991 mbar (hPa)

On March 9, an area of low pressure developed to the north of Kimberley.[66] Over the next 3 days, the low moved into the Timor Sea, as the storm slowly intensified. On March 12, TCWC Darwin reported that the storm had intensified into a tropical low and gave it the identification 17U.[67] As the storm approached the northern coast of Western Australia, it continued to intensify slowly. On March 14, 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.[68] 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 March 16. Late on March 15, 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 March 17, 17U began to stall in the southeastern Gulf of Carpentaria. Late on March 18, TWCW Brisbane issued their last asvisory 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 March 19, Tropical Low 17U began moving southward, deeper into Queensland. Early on March 20, wind shear began weakening the storm, as it turned eastward. Late on March 21, 17U began emerging off the eastern coast of Queensland, as it was drawn towards a powerful extratropical cyclone, to the east. By March 22, the extratropical storm had absorbed Tropical Low 17U, and thus the storm was dropped from TCWC Brisbane's outlook.

April Darwin Tropical Low

Tropical low (Australian scale)
Duration April 16 – April 25
Intensity Winds unknown,  1005 mbar (hPa)

In mid-April, TCWC Darwin reported that a tropical low had formed, just off the southern coast of New Guinea. As the storm slowly moved northwestwards, it impacted southern part of the island. The storm then turned southward, and quickly to the west, and continued moving in that direction for the next few days. On 16 April, a low that TCWC Darwin had been tracking in the Arafura Sea became a tropical low, near West Papua.[69] Within the next day, the tropical low slightly intensified and reached its peak intensity.[70] Later on 17 April, the tropical low quickly began to weaken, as it slowly moved west-southwestwards, within the Arafura Sea. On April 18, the tropical low lost much of its convection. Early on 19 April, the storm slightly strengthened and reached its peak intensity, despite its disorganization, and the dry air near the storm.[71] On 20 April, the tropical low moved into the Timor Sea, north of the Tiwi Islands, and began to weaken again.[72] During this time, the outer rainbands of the tropical low, began to affect the northern coast of the Northern Territory, especially the Tiwi Islands, which were much closer to the storm's center. The storm "stalled" near the Northern Territory for another day, before slowly leaving the region. Late on the same day, the tropical low became highly disorganized, and lost most of its convection, even as the storm approached Western Australia. On 21 April, the tropical low turned southwestward. The storm's outermost rainbands soon began affecting Western Australia's northernmost coast. On 23 April, TCWC Perth began issuing advisories on the Tropical Low, as it moved into their area of responsibility.[73] On 24 April, the tropical low rapidly began to weaken. Late on 24 April, the tropical low impacted Western Australia's northwestern coast, as it regained some convection, although the center of circulation itself was miles offshore. Afterwards, the storm turned northward, then quickly turned northeastward. Early on 25 April, TCWC Perth dropped the tropical low from their 3-day Tropical Outlook, as the storm dissipated.

Tropical Depression 19S

Tropical depression (Australian scale)
Tropical depression (SSHS)
Duration 7 May – 14 May
Intensity 55 km/h (35 mph) (10-min),  996 mbar (hPa)

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.[74] 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 Island. On 11 May, Tropical Depression 19S turned westward, as it slighly organized. Early on 11 May, Tropical Depression 19S impacted southwestern Timor Island 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.

Season effects

This table lists all the storms that developed in the Southern Hemisphere during the 2011–2012 Australian region cyclone season. It includes their intensity, duration, name, landfalls, deaths, and damages. The damage figures are all in 2012 USD.

Storm
Name		 Dates active Storm category
at peak intensity		 Peak 10-min
sustained winds		 Pressure
hPa		 Areas affected Damage
(AUD)		 Damage
(USD)		 Deaths Notes
Alenga 3 – 11 December Category 3 severe tropical cyclone 150 km/h (90 mph) 968 hPa (28.59 inHg)
No land areas affected.
 [2]
Fina 19 – 23 December Category 1 tropical cyclone 65 km/h (40 mph) 994 hPa (29.35 inHg)
No land areas affected.
Perth TL (Benilde) 21 – 28 December Tropical low Unknown Unknown
No land areas affected.
Grant 21 – 30 December Category 2 tropical cyclone 100 km/h (65 mph) 978 hPa (28.87 inHg) Northern Territory, Queensland
Heidi 9 – 13 January Category 2 tropical cyclone 110 km/h (70 mph) 975 hPa (28.80 inHg) Western Australia
January Darwin TL 21 – 29 January Tropical low 55 km/h (35 mph) 993 hPa (29.34 inHg) Northern Territory, Eastern Australia
Iggy 22 January – 3 February Category 2 tropical cyclone 100 km/h (65 mph) 970 hPa (28.66 inHg) Western Australia, Indonesia 16
Jasmine 1 – 7 February Category 2 tropical cyclone 100 km/h (65 mph) 979 hPa (28.94 inHg) Northern Territory, Queensland
Perth TL (Hilwa) 5 – 14 February Tropical low Unknown 1000 hPa (29.53 inHg)
No land areas affected.
Koji-Joni 6 – 8 March Category 1 tropical cyclone 75 km/h (45 mph) 993 hPa (29.32 inHg)
No land areas affected.
Lua 10 – 18 March Category 4 severe tropical cyclone 165 km/h (105 mph) 930 hPa (27.46 inHg) Western Australia
17U 12 – 22 March Tropical low 55 km/h (35 mph) 993 hPa (29.32 inHg) North-Western Australia, Queensland
April Darwin TL 16 – 25 April Tropical low Unknown 1005 hPa (29.68 inHg) New Guinea, Northern Territory
19S 7 – 14 May Tropical Depression 55 km/h (35 mph) 996 hPa (29.41 inHg) Indonesia
Season Aggregates
20 Lows 3 December – 14 May 165 km/h (105 mph) 942 hPa (27.82 inHg) 16

See also

Portal icon Tropical cyclones portal

References

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  2. ^ a b c d e f Western Australian Regional Office (Perth Tropical Cyclone Warning Center) (2011-12-14). Severe Tropical Cyclone Alenga (Report). Australian: Bureau of Meteorology. http://www.bom.gov.au/announcements/sevwx/wa/watc20111203.shtml. Retrieved 2011-12-18. 
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  6. ^ a b Perth Tropical Cyclone Warning Center. "Tropical Cyclone Technical Bulletin 2011-12-08 12z". Bureau of Meteorology. Archived from the original on 2011-12-08. http://www.webcitation.org/63meL5SEQ. Retrieved 2011-12-08. 
  7. ^ Perth Tropical Cyclone Warning Center (2011-12-22). "Tropical Cyclone three-day outlooks for the Western Region 8–12 December 2011". Australian: Bureau of Meteorology. http://www.webcitation.org/645OP85ai. Retrieved 2011-12-22. 
  8. ^ a b c Brisbane Tropical Cyclone Warning Center (2012-01-07). Tropical Cyclone Fina (Report). Bureau of Meteorology. Archived from the original on 2012-01-07. http://www.bom.gov.au/announcements/sevwx/qld/qldtc20111222.shtml. Retrieved 2012-01-07. 
  9. ^ Joint Typhoon Warning Center. "Significant tropical weather advisory for the Western and Southern Pacific Ocean 2011-12-19". United States Navy, Untied States Airforce. Archived from the original on 2011-12-22. http://www.webcitation.org/646QNW6ik. Retrieved 2011-12-22. 
  10. ^ Brisbane Tropical Cyclone Warning Center (2011-12-21). "Tropical Cyclone Technical Bulletin for Tropical Cyclone Fina 2011-12-21 18:00 UTC". Australian Bureau of Meteorology. http://www.webcitation.org/646VeNf51. Retrieved 2011-12-21. 
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  12. ^ "TC Track". BOM. 25 December 2011. http://www.bom.gov.au/products/IDD65011.shtmll. Retrieved 25 December 2011. 
  13. ^ http://www.weatherzone.com.au/news/top-end-communities-feeling-grants-fury/19735
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External links

Tropical cyclones of the 2011–12 Australian region cyclone season
Australian Tropical Cyclone Scale
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