[5] On 23 January, a tropical low was monitored for a couple days before entering the South-West Indian Ocean, which later became Cyclone Batsirai and caused devastation to Madagascar.

[6] A week later, Tropical Low 17U formed and initially the system had deep convection and a well defined center, but easterly shear and dry air prevented strengthening and was last noted on 14 February.

Anika made a second landfall east of Pardoo, and briefly developed a better inner core inland due to the brown ocean effect.

On 11 March, Tropical Low 27U formed south of Java and quickly developed an inner core before being named Billy and stayed out to sea as the system eventually succumbed to high wind shear.

[20] At this time, it started to incline more southwards under the influence of an upper trough moving to the east and a subtropical ridge to its south strengthening, with its pressure bottoming to 997 mbar (29.44 inHg).

As it turned to the south-southwest as the ridge to its south strengthened further, the synoptic gradient between the two increased, letting the storm reintensify slightly that same day, though gale-force winds were not wrapping halfway of the system.

[28] By the next day, the BoM briefly upgraded it to a Category 1 tropical cyclone on the Australian scale, and named it Teratai which was given by TCWC Jakarta.

[5][63] The storm then rapidly weakened and made landfall over the Cape York Peninsula as a category 1 tropical cyclone at 06:00 UTC on 10 January.

Flooding occurred along the Fitzroy River, covering roads, washing out topsoil, knocking down fences, and toppling trees.

[79] Under a favorable environment of warm sea surface temperatures, lowering wind shear and good outflow aloft, the system continued to consolidate, prompting the JTWC to issue a TCFA by the next day,[80][81] before subsequently upgrading it to a tropical cyclone, and designated it as 09P.

[83] However, 16U did not intensify further as a dry air entrainment hampered the system's intensification, while continuing to move east-southeast under a near-equatorial ridge positioned to the north and northeast.

[90] Under an environment of warm sea surface temperatures, lowering vertical wind shear and fair poleward outflow, the low started to organize, with deep convection wrapping to its low-level circulation center, prompting the JTWC to issue a TCFA by the next day.

[91] However, as it moved south-southwest,[92] the wind shear started to increase, leading to its LLCC becoming exposed and the JTWC cancelling the TCFA on 10 February.

[102] Under a favorable environment of warm sea surface temperatures, low wind shear, and increasing poleward outflow, the system organized further, prompting the JTWC to issue a TCFA at 14:00 UTC that same day.

[104] Moving west-southwest along the northern periphery of a deep-layered subtropical ridge to the south, Vernon went on a rapid intensification phase over the day, with BoM and JTWC upgrading Vernon into a category 3 severe tropical cyclone in the Australian scale and a category 1-equivalent tropical cyclone in the Saffir-Simpson scale respectively 12 hours later, as it developed a pinhole eye.

[7] On 20 February, the BoM noted a possible formation of a tropical low over the Arafura Sea, as a trough over northern Australia was expected to be more active.

[17] Under a favorable environment of warm sea surface temperatures and pronounced outflow being offset by high wind shear, the low continued to organize, with the JTWC issuing a TCFA late on 24 February.

[8] The JTWC subsequently followed suit and upgraded the system into a tropical storm, noting deep and cold convection covering its low-level circulation center.

[122] Under a marginal environment of warm sea surface temperatures and robust outflow aloft offset by high wind shear, the low started to consolidate, prompting the agency to issue a TCFA late on 1 March.

[10] The JTWC estimated its peak intensity with 1-minute sustained winds of 60 knots (110 km/h; 69 mph), based on microwave imagery showing a well-formed eye.

[134] On 15 March, the BoM gave 27U the name Billy,[135] before the system started to weaken due to a dry air entrainment, along with increasing wind shear.

[141] As it moved westwards across Timor-Leste into the Indian Ocean,[11] the JTWC started to monitor the system on 18 March, with deep convection displaced to the west of its elongated low-level circulation center.

[11][149] As its low-level circulation center became exposed on 23 March, the BoM downgraded Charlotte to a category 2 tropical cyclone at 12:00 UTC, before it weakened into a remnant low six hours later.

[11] On 30 March, the BoM reported that Tropical Low 30U was developing south of Christmas Island, near 810 km (500 mi) northwest of Exmouth.

[12] As the low approached the southern Western Australia coast, it brought heavy rainfall along the area, with 118.66 millimetres (4.672 in) of rain reported at Carnarvon.

[159] The cyclone intensified and the agency released unusual bulletins about the possibility of reaching Category 1, even though it did not pose a threat to any habitable areas.

[14] Upon post-analysis, the BoM found that another low-level circulation center formed on 25 April that was not part of 34U; hence, the earlier system was assigned the identifier 37U.

[15] The storm then started to weaken, as it turned south-southeastwards under the influence of a near-equatorial ridge to the northwest, into an unfavorable environment of cooler sea surface temperatures and high wind shear.

[166] This forecast was materialized when the bureau started to track a weak tropical low outside the Western Region on 9 November, while located at 400 kilometres (250 mi) to the north-northeast of the Cocos Islands.

[168] The tropical low then passed to the south of the archipelago before turning westwards and exiting the basin into the South-West Indian Ocean region by 14 November.