Early activity

The season officially started on 1 November, however the first system, Cyclone Jasper, was not active until 4 December, when it crossed into the basin as a tropical low from the South Pacific. The low became a named storm on 5 December, receiving the name Jasper,^[5] and intensified into the season's first severe tropical cyclone the next day.^[6] Jasper made landfall in Far North Queensland as a Category 2 tropical cyclone on 13 December.^[7] After a significant lull in activity, Tropical Lows 04U and 03U formed on January 10 and 11 respectively.^[8][9] Tropical Low 05U formed on 12 January.

Severe Tropical Cyclone Jasper

Category 4 severe tropical cyclone (Australian scale)
Category 4 tropical cyclone (SSHWS)
Duration	4 December (Entered basin) – 18 December
Peak intensity	195 km/h (120 mph) (10-min); 938 hPa (mbar)

On 2 December, the BoM reported that Tropical Disturbance 03F, which was re-designated as Tropical Low 02U, had formed in the South Pacific Ocean in Fiji's area of responsibility.^[10] Two days later, on 00:00 UTC of 4 December, the system would enter the Australian area of responsibility.^[11][12] The JTWC issued a Tropical Cyclone Formation Alert (TCFA) later that day, projecting a high likelihood of a significant tropical cyclone developing.^[13] Later the next day, the JTWC subsequently initiated advisories on the system and classified it as Tropical Cyclone 03P.^[14] The BoM subsequently followed suit and upgraded it to a Category 1 tropical cyclone, naming it Jasper.^[5] Jasper started to track southward under the steering influence of a near equatorial ridge to the east.^[15] During the next day, the cyclone's center continued to organize, with deep convective bands starting to wrap around the center, prompting the JTWC to upgrade the system to a Category 1 hurricane.^[16] Jasper rapidly intensified into a Category 3 severe tropical cyclone,^[6] due to being in an environment with warm sea surface temperatures and low wind shear.^[17]

The next day, it further intensified, becoming a Category 4 severe tropical cyclone.^[18] Shortly thereafter, Jasper began weakening, with its eye becoming cloud-filled and the deep convection eroding due to dry air entrainment.^[19] Jasper would reintensify, and at 12:00 UTC on 13 December, made landfall as a Category 2 tropical cyclone in Wujal Wujal, Queensland.^[7] After making landfall, the JTWC discontinue warnings on the system later that day.^[20] However, Jasper remained traceable, and the BoM would give the tropical low a moderate chance of redeveloping into a tropical cyclone on 15 December.^[21] By 14:00 UTC that day, the BoM reported that Jasper had weakened to a tropical low.^[22] However, Jasper remained traceable, and the BoM would give the tropical low a moderate chance of redeveloping into a tropical cyclone on 15 December.^[21] However, they would soon downgrade its chances of re-developing into a very low as the storm turned southeast further inland, and on 18 December, Jasper was last noted over the Cape York Peninsula.^[23]

Jasper dropped very heavy rainfall, peaking at 2,252 mm (88.7 in) at Bairds near the Daintree River. If verified, this would make Jasper the wettest tropical cyclone to impact Australia on record.^[24] Many locals used personal watercraft to extract people who were trapped on their roofs within the coastal suburbs.^[25] Some flights were canceled at the Cairns Airport.^[26] One man died and missing due to flooding caused by Jasper.^[27][28] Insurance Council of Australia estimate that Jasper was responsible at AU$1 billion (US$675 million).^[29]

Tropical Low 04U

Tropical low (Australian scale)
Tropical storm (SSHWS)
Duration	10 January – Present
Peak intensity	55 km/h (35 mph) (10-min); 1004 hPa (mbar)

On 9 January, the BoM noted that a tropical low may form in the Indian Ocean, designating it as 04U.^[30] Later the next day, the BoM reported that it had formed to the northwest of the Cocos Islands.^[8] On 11 January, the JTWC would begin to monitor the low.^[31] Three days later, they would issue a Tropical Cyclone Formation Alert (TCWC), expecting it to become a tropical cyclone.^[32]

Tropical Low 03U

Tropical low (Australian scale)
Duration	11 January – Present
Peak intensity	Winds not specified; 1001 hPa (mbar)

On 7 January, the BoM noted the possibility of a tropical low forming near the north Kimberley, as a monsoon trough was expected to develop along the Top End. It was predesignated as 03U.^[33] This came to fruition 4 days later, when the BoM reported that it was developing over the southern Joseph Bonaparte Gulf within the trough.^[9] The JTWC would begin to monitor it on January 14.^[34]

Tropical Low 05U

Tropical low (Australian scale)
Duration	12 January – Present
Peak intensity	Winds not specified; 1002 hPa (mbar)

Alongside 04U, the BoM also noted the possibility of a tropical low forming within the monsoon trough over the Gulf of Carpentaria on 9 January. It was predesignated as 05U.^[30] 3 days later, the BoM reported that it was developing over the eastern portion of the gulf.^[35]

Bureau of Meteorology

The Australian Bureau of Meteorology (TCWC Melbourne) monitors all tropical cyclones that form within the Australian region, including any within the areas of responsibility of TCWC Jakarta or TCWC Port Moresby.^[36] Should a tropical low reach tropical cyclone strength within the BoM's area of responsibility, it will be assigned the next name from the following naming list. The names that will be used for the 2023–24 season are listed below:

TCWC Jakarta

TCWC Jakarta monitors all tropical cyclones active from the Equator to 11S and from 90E to 145E. Should a tropical depression intensify into a tropical cyclone within TCWC Jakarta's Area of Responsibility, it will be assigned the next name from the following list.^[36]

TCWC Port Moresby

Tropical cyclones that develop north of 11°S between 151°E and 160°E are assigned names by the Tropical Cyclone Warning Centre in Port Moresby, Papua New Guinea. Tropical cyclone formation in this area is rare, with no cyclones being named in it since 2007.^[37] As names are assigned in a random order, the whole list is shown below: