Tropical Cyclone 01U On 26 July, the
Bureau of Meteorology (BoM) reported that a tropical low had formed due to an increase in monsoonal storm activity during the
Madden–Julian oscillation (MJO). Deep convection became more pronounced and organized with an
upper-level trough around the center. The system was located in a favorable environment, with
sea surface temperatures ranging from 28 to 30 degrees Celsius, and the JTWC issued their first warning on the storm six hours later as
Tropical Cyclone 01S. During post-storm analysis from the BoM, the system was upgraded into a Category 1 tropical cyclone on 29 July, although it remained unnamed. Later that day, 01U completely dissipated. Satellite imagery revealed that the system was displaced from its center of circulation. Environmental conditions were assessed by the BoM as being unfavorable for significant intensification of the system. The system was assigned the official identifier code
02U. Throughout the twelve hours, the system improved. Later that day, the JTWC subsequently initiated advisories on the system and classified it as
Tropical Cyclone 04S. The system had a broad and fully exposed LLCC, although there was some thunderstorm activity associated with the system. The BoM would stop tracking the system on 5 November. The system would briefly exit the basin and enter the South-West Indian Ocean basin the same day.
Severe Tropical Cyclone Darian On 13 December, the BoM reported that Tropical Low 05U had formed approximately north of Cocos Islands, initially forecast to not develop further due to not conducive conditions. However, over the next 5 days, conditions improved, with vertical wind shear decreasing. At 11:30 UTC on 17 December, satellite imagery showed a partially exposed low-level center embedded in deep convection, prompting the JTWC's to issue a TCFA. On the next day, the system strengthened into a Category 1-cyclone on the
Australian scale, with BoM naming it
Darian. Later that day, the JTWC initiated advisories on the system and classified it as
Tropical Cyclone 05S. The BoM's assessed the cyclone to have strengthened into a Category 2 cyclone on 19 December and later to Category 3 cyclone on the Australian scale. By 15:00 UTC, the JTWC upgraded Darian to a Category 1-equivalent cyclone on the
Saffir–Simpson hurricane wind scale (SSHWS), with maximum 1-sustained winds of . Darian then strengthened to a Category 3 equivalent cyclone on the SSHWS in an environment of low wind shear, warm sea surface temperatures and good
upper-level poleward outflow, which led to the storm having a symmetric eye. The cyclone quickly intensified, and was upgraded to a Category 4 cyclone by the BoM. Similarly, the JTWC's further upgraded Darian to a Category 4-equivalent cyclone around 21:00 UTC, while exhibiting some
annular characteristics. Darian continued to
rapidly intensify, and reached Category 5 intensity on the Australian scale at 00:00 UTC on 21 December. Later that day, it exited the basin and moved into the South-West Indian Ocean basin.
Tropical Cyclone Ellie During late December, a strong pulse of the MJO tracked eastwards across the equatorial
Indian Ocean, and approached Australian longitudes. During 20 December, the BoM reported that a tropical low formed within the monsoon trough northwest of
Darwin in the
Timor Sea. Initially located in a favorable environment for intensification, the disturbance began to encounter somewhat improved conditions. Satellite imagery indicated an improvement in the structure of the disturbance, with the system displaying an increase in flaring deep convection. The JTWC issued a TCFA for the system at 02:00 UTC on 22 December. The low was assigned the official identifier code
06U. By 09:00 UTC, the JTWC subsequently designated the storm as
Tropical Cyclone 06S, citing that convection quickly became better organized and more concentrated around the broad center. Later that day, the BoM's reported that the tropical low had developed into a Category 1-cyclone on the Australian scale and named it
Ellie. Ellie then later crossed the
Northern Territory (NT) coast, making
landfall at a sparsely populated location southwest of
Daly River at 13:30 UTC (11:00 pm
ACST). The BoM then gave the tropical low a moderate chance of redeveloping into a tropical cyclone on 1 January. However, they later downgraded its chances of redeveloping into very low, as the storm turned southeast further inland and was weakening. The cyclone, then referred to as "ex-Tropical Cyclone Ellie", turned back into the Northern Territory on around 7 January, and eventually dissipating over the southwest of the Northern Territory on 8 January. The cyclone mainly caused torrential rainfall and gale-force wind gusts along the
Top End as it became a tropical cyclone.
Timber Creek experienced "once-in-50-year" flooding as the cyclone moved through the town by 24 December. Heavy rainfall led to water levels within the
Fitzroy River reaching , surpassing its 2002 record of . By January, the river was wide in some parts. Flooding continued into January, with WA
Emergency Services Minister,
Stephen Dawson, saying that it was a "once in a century" flood crisis. Infrastructure was damaged and remote
Indigenous communities completely cut off. Defence personnel were deployed to the
Kimberley region in WA, three
RAAF aircraft were provided to evacuate residents, and five helicopters were despatched to help with the crisis.
Tropical Low 07U (Hale) By 31 December, the BoM noted the potential of a tropical low forming over the
Coral Sea, as the monsoon was forecast to strengthen further over the region. Three days later, the agency put a low chance for the potential low to develop into a tropical cyclone in the region. By 6 January, the BoM reported that Tropical Low 07U had developed approximately to the north-northeast of
Townsville in
Queensland. The JTWC gave it a medium chance to develop into a tropical cyclone, before issuing a TCFA saying that the chance for the system to develop into a tropical cyclone was high 8 hours later. With a favorable environment of low wind shear, warm sea surface temperatures, and good radial outflow, the system intensified into a tropical cyclone late on the same day according to the JTWC, and designating it as
07P. The BoM did not upgrade 07U as such, citing that its center was elongated northwest to the southeast. 07U then later exited the basin and moved into the South Pacific basin.
Tropical Low 10U On 19 January, the BoM noted that a tropical low may form within a monsoon trough that was forming over the Gulf of Carpentaria, and was expected to extend into the
Arafura Sea. Over the next few days, the low slowly formed within the trough, and by 22 January, the agency reported that Tropical Low 10U had formed, approximately to the north of
Nhulunbuy. The tropical low moved generally westwards, and was last noted on 26 January while being located about west-northwest of
Kalumburu.
Tropical Low 11U (Dingani) On 3 February, Tropical Low 11U developed close to the Australian Area of Responsibility (AOR) boundary and headed west toward Cocos Islands. The low continued to be weak as the conditions were unfavorable for development. 11U then continued southwest, intensifying significantly. 11U exited the basin towards the South-West Indian Ocean on 9 February.
Tropical Low 12U On 30 January, the BoM highlighted that a weak low could form near
Christmas Island, as the monsoon trough began to be more active across the tropics. By the next day, the weak low formed within the trough, and the agency classified it as
12U. For the next few days, the low moved slowly, before encountering unfavorable conditions for development by 3 February. The BoM last noted 12U about to the south of Christmas Island on the next day.
Severe Tropical Cyclone Freddy On 4 February, the BoM reported that a Tropical Low 13U had formed during an active phase of the MJO in conjunction with an equatorial
Rossby wave, while it was situated to the south of the
Indonesian archipelago. Afterwards, the JTWC issued a TCFA, noting that the disturbance was located in a favourable environment. Deep convection increased and the system became a Category 1 tropical cyclone on the Australian scale by 12:00 UTC; the BoM
assigned it the name Freddy. Freddy then rapidly intensified and developed an
eye feature on microwave imagery, leading the JTWC to classify it as having near-equivalent intensity around 15:00 UTC on 7 February. After its first peak, the system became increasingly susceptible to wind shear and dry air intrusion, causing Freddy to weaken back into a minimal tropical storm by 09:00 UTC on 9 February. Freddy's deep convection around the storm's center had significantly decreased. Thus, the system was initially classified as a
tropical cyclone status before being later upgraded to
intense tropical cyclone status around 18:00 UTC that day.
Severe Tropical Cyclone Gabrielle On 5 February, a tropical low formed in the Coral Sea south of the
Solomon Islands. At around the same time, the system's LLCC was exposed with persistent disorganized convection. Over the next day, as the system moved southwards, it developed further, with satellite imagery showing an increase in the cyclonic curvature of the convection. Later at 06:00 UTC, the JTWC issued a TCFA, after noting its obscure LLC. By 03:00 UTC on 8 February, the JTWC initiated advisories on the system and classified it as
Tropical Cyclone 12P, when the fragmented banding was wrapping broadly into the exposed consolidating LLC. Late on the same day, the BoM reported that the tropical low had developed into a Category 1 tropical cyclone and named it
Gabrielle. The cyclone slowly drifted southwards while deep convection consolidated, and the system was upgraded into a Category 2 tropical cyclone, while the JTWC upgraded Gabrielle to the equivalent of a low-end Category 1-equivalent cyclone with winds of . By 18:00 UTC on 9 February, the storm continued to intensify and soon became a Category 3 severe tropical cyclone. Later the next day, it exited the basin and moved into the South Pacific basin, where it became a Category 2-equivalent cyclone.
Tropical Low 15U On 11 February, the BoM reported that Tropical Low 15U was forming over the eastern
Top End. The JTWC had also begun monitoring the disturbance, which the agency classified it by the code identifier
Invest 91P, and gave it a low chance for development. The next day, the JTWC later upgraded the system's chance for development to medium. The BoM later assessed 15U to still be a weak tropical low, and gave it a low chance for development. The low then moved slowly southeastwards, before moving inland on 16 February and being last noted on the BoM's tropical cyclone outlooks by the next day.
Tropical Low 16U On 22 February, Tropical Low 16U formed to the north of
Port Hedland and slowly drifted northeast. Even though the low did not intensify into a tropical cyclone, 17U was last noted on 27 February.
Tropical Low 18U (Kevin) On 27 February, a weak tropical low formed off the coast in Queensland. The BoM designated it as 18U. The JTWC began monitoring the tropical low and setting the chance of tropical cyclone development as low. On 1 March, the JTWC issued a TCFA on the system due to the system having much improved structure. The tropical low entered the
South Pacific basin the same day where it became designated as Tropical Depression 09F by the FMS.
Tropical Low 20U A tropical low formed on 25 March near
East Timor. It headed generally southwestward before dissipating on 30 March.
Severe Tropical Cyclone Herman On 28 March, a weak tropical low formed to the north of the Cocos Islands and traveled southeast over open seas. Satellite imagery showed that flaring convection which was circulating over the obscured LLCC. Later the next day, the JTWC issued a TCFA, and upgraded the system to a
Tropical Cyclone 17S. Later that day, the BoM reported that the tropical low had developed into a Category 1 tropical cyclone on the Australian scale and named it
Herman. Later, the BoM's assessed the cyclone to have strengthened into a Category 2 tropical cyclone with 10-minute sustained winds of . Herman intensified further with an eye feature starting to appear on microwave imagery. Multispectral animated satellite imagery revealed an exposed LLCC with deep convection persisting along the western periphery of the LLCC and reaching 1-minute maximum sustained winds of . Herman had further intensified to a Category 4 cyclone with a well-defined eye. Continuing to rapidly intensify, Herman then strengthened into a Category 5 severe tropical cyclone, with 10-minute average winds of . Herman saw less favorable conditions on 1 April after peaking on 31 March as dry air was swallowed into the circulation. The storm continued to weaken, the BoM's estimated winds of . Herman became increasingly ragged and elongated as deep convection diminished and started to become displaced. During 2 April, while continuing to weaken, both the BoM and JTWC ceased issuing advisories. By this time, the system had turned west and was dissipating over the open waters of the Indian Ocean on 4 April. The system remained weak as it moved west-southwest, before degenerating on 2 April.
Severe Tropical Cyclone Ilsa On 6 April, a tropical low formed in the Timor Sea as a result of an active burst of the monsoon trough. The JTWC later issued a TCFA on the next day. During the following day, the JTWC initiated advisories on the system and classified it as
Tropical Cyclone 18S. The low drifted slowly southwest during the next several days, although development was delayed by unfavorable environmental condition. The next day, it intensified into a Category 3 severe tropical cyclone while also being upgraded to a Category 2-equivalent tropical cyclone on the SSHWS. Later the next day, the BoM assessed the storm to have attained ten-minute sustained winds of , ranking it as a Category 4-cyclone. On 13 April, the JTWC also assessed Ilsa to have attained an intensity equivalent to a Category 4-equivalent tropical cyclone on the
Saffir–Simpson hurricane scale. Later that day, Ilsa strengthened further to its peak intensity as a Category 5-equivalent tropical cyclone with 1-minute sustained winds of . An automated
weather station on
Rowley Shoals recorded wind gusts up to . Later that same day, Ilsa had become a Category 5 severe tropical cyclone with sustained winds of . A record-breaking
ten-minute sustained wind speed of was measured at
Bedout Island, beating the previous record of
Cyclone George in 2007. The cyclone crossed the coast about northeast of
Port Hedland on 16:00 UTC, with sustained winds of . Shortly after the landfall, the JTWC discontinued warnings on the system. While over
Western Australia, Ilsa weakened to a low-end tropical cyclone with winds. Ilsa was last noted on 15 April. The JTWC released a TCFA stating that the low could intensify soon and called it
Invest 94S. The next day, the JTWC canceled its TCFA and lowered its chances to low. It continued to move eastwards before being last noted on 24 November. • On 30 November, the BoM reported that a weak tropical low had developed along a trough over central
Gulf of Carpentaria. It generally moved southeast before being last noted by BoM on 2 December, near the western
Cape York Peninsula. • On 13 January, the BoM noted the potential of a tropical low forming in the eastern Coral Sea. By the next day, the
Fiji Meteorological Service (FMS) designated the potential low as Tropical Disturbance 05F, while it was still in the BoM's area of responsibility. 05F briefly entered the South Pacific basin on 15 January, before subsequently moving back into the region late by the same day. On 16 January, the BoM upgraded 05F into a weak tropical low. The JTWC issued a TCFA on the system on 17 January, stating its chance to develop into a tropical cyclone was high. Later that day, it exited the basin again and moved into the
South Pacific basin. • On 15 January, the BoM noted the potential of another tropical low forming, this time in the northern Coral Sea, within a monsoon trough that was expected to form. Two days later, the agency reported that the tropical low had formed, and gave it a high chance of developing into a tropical cyclone within the basin. The JTWC subsequently issued a TCFA the next day. Continuing southeastwards, the tropical low then exited the basin and into the South Pacific basin on 20 January, where it was immediately designated as
Tropical Depression 06F by the FMS. • On 17 February, the BoM reported that a weak tropical low had formed within a trough, south of Indonesia. It was last noted the next day. • On 30 April, a weak tropical low southeast of
Christmas Island was noted by the BoM in their daily bulletins. Environmental conditions were not favorable for further development of the low as it tracked westward. The tropical low was last noted to have weakened into the trough on 2 May. == Storm names ==