2018–19 Australian region cyclone season

[6] The system turned westwards and began tracking back towards the Australian region the next day,[7] but was assessed as having weakened into a tropical depression prior to exiting the South Pacific basin on 28 September.

[8] After re-entering the Australian region, Ex-Tropical Cyclone Liua's weakening trend continued due to unfavourable atmospheric conditions and the cool sea surface temperatures of early spring.

[8][10][11][12]A weak low-pressure system developed in the equatorial Indian Ocean in Météo-France's area of responsibility on 1 November and moved slowly eastwards over the following few days while showing little sign of intensification.

[13] Late on 9 November, as the developing precursor depression to Severe Cyclonic Storm Gaja in the Bay of Bengal moved further away and the competing low-level airflow convergence associated with it diminished,[14] the system's structure organised sufficiently to be classified as a tropical disturbance by Météo-France.

[16] Later the same day, the JTWC assessed the developing low as having attained tropical storm status on the Saffir-Simpson Hurricane Wind Scale, and assigned the system the unofficial designation 04S.

[17] A few hours later, at 10:00 UTC, the system moved back westwards and returned to the South-West Indian Ocean basin,[18] where it gained the name 'Bouchra' from Météo-France and underwent a twelve-hour phase of rapid intensification to severe tropical storm status.

[21] The period of residence in the Australian basin proved to be short-lived once again, however, with Météo-France indicating that Ex-Tropical Cyclone Bouchra had returned to the far-eastern part of their area of responsibility early on 13 November.

Owen made landfall near Kowanyama early on 15 December as a low-end Category 3 severe tropical cyclone and gradually weakened thereafter due to land interaction.

During the storm's passage over northern Queensland, Owen killed a person and produced steady rainfall throughout the region, with the highest totals predicted for the eastern coast compared to the southwestern portions of the state.

[33] Maintaining its westward motion, the system emerged over the Gulf of Carpentaria very early in the morning of 31 December, crossing the Queensland coast between Aurukun and Weipa, where generally favourable conditions fuelled intensification.

[34] Tropical Cyclone Penny made landfall on the western Cape York Peninsula coastline, just south of Weipa, at approximately 15:30 local time on 1 January,[35] generating maximum ten-minute sustained winds of 75 kilometres per hour (47 mph) near the centre.

[36] Ex-Tropical Cyclone Penny crossed the east coast of Far North Queensland at Lockhart River in the early hours of the next morning, bringing the system over the warm waters of the Coral Sea for a second time.

[37] Ex-Tropical Cyclone Penny quickly tracked eastwards across the Coral Sea, while regaining the organisation and convective structure that had been eroded due to land interaction over Cape York Peninsula.

A weak tropical low developed in a monsoon trough stretching across the northern Coral Sea on 28 December, situated in the far northeast of the Eastern Region, near the southern Solomon Islands.

Experiencing extremely favourable atmospheric conditions and very warm sea surface temperatures, Tropical Cyclone Veronica proceeded to intensify rapidly throughout the day, attaining Category 3 status on the Australian scale just 18 hours later.

[63] Rio Tinto's Cape Lambert port wharf also sustained damage from waves generated by the cyclone, and repairs to the company's Robe River sorting facility following a fire earlier in the year were delayed during the event.

Late on 8 April, the BoM upgraded Wallace to a Category 3, estimating peak winds of 120 kilometres per hour (75 mph), while the storm was located approximately 530 km (330 mi) to the north-northwest of the town of Karratha.

[93] The system began moving westward from the Torres Strait towards the northeastern coast of the Top End without any significant intensification due to generally unfavourable atmospheric conditions for cyclogenesis.

[95] As the system tracked generally westwards into the Timor Sea and began to roughly retrace the path that Severe Tropical Cyclone Wallace had taken a few days earlier,[96] the low showed some signs of intensification.

[99] The tropical low made landfall on the coast of Western Australia near the town of Onslow, to the east of the Exmouth Gulf, on the afternoon of 14 April (local time).

[101] The weakened and shallow system proceeded eastwards towards the Northern Interior district of Western Australia, while continuing to unravel, dissipating by 05:00 UTC on 15 April, while located over the Great Sandy Desert.

[106] Upon nearing land in the far western Pilbara, the tropical low delivered moderate rainfall and gusty winds to locations throughout the region's coastal fringe and nearby islands.

[116] It was noted that environmental conditions in the vicinity were largely favourable for continued development, with good poleward upper-level outflow and warm sea surface temperatures, with the only mitigating factor being moderate to high vertical wind shear to the north and south of the low.

[117] As Lorna tracked east-southeastward towards the Australian region, the low-level circulation of the tropical low began to elongate, with the distribution of deep convective activity becoming increasingly fragmented.

[120] A moderate to strong pulse of the Madden–Julian oscillation moved eastwards across the Maritime Continent during early May, generating unseasonal monsoonal activity throughout the Indonesian archipelago and far-northern parts of Australia.

[121] As this pulse had tracked across the Indian Ocean during the preceding fortnight,[121] it had contributed to the favourable conditions which facilitated the intensification of Extremely Severe Cyclonic Storm Fani in the Bay of Bengal.

On 4 May, the Bureau of Meteorology noted the formation of a weak tropical low approximately 750 km (470 mi) to the north-northwest of Darwin, embedded within a low-pressure trough extending from Borneo to New Guinea.

Strong flaring convection began to surround the system as its low-level circulation centre consolidated on 7 May, and as a result, the JTWC issued a Tropical Cyclone Formation Alert at 17:30 UTC.

[140] The storm's low-level circulation proceeded to organise as deep convection developed around the centre, and the BOM upgraded the system to a Category 1 tropical cyclone at 18:00 UTC on 11 May, assigning the name Ann.

On 9 December, the Bureau of Meteorology announced the development of a weak tropical low from a low-pressure system moving westwards through the mid-eastern Coral Sea, located approximately 1,100 km (680 mi) east-northeast of Townsville.