[1] Due to its minimal intensity, 04S was designated only as a tropical storm strength cyclone by the Joint Typhoon Warning Center (JTWC).

During the middle of January, an ill-defined tropical low formed within the Intertropical Convergence Zone, near the Cape York Peninsula and moved eastwards into the Coral Sea.

[3] Later that day, as the system approached 160°E and the South Pacific basin, TCWC Brisbane reported that the low had become a tropical cyclone and named it Nigel.

On 17 February the BoM reported that an ill-defined tropical low had developed within the intertropical convergence zone, near the tip of the Cape York Peninsula.

[6][7] During 20 February TCWC Brisbane reported that the low had become a tropical cyclone and named it Pierre, while it was located about 160 km (100 mi) to the east of Cooktown.

[3][7] The system subsequently accelerated south-eastwards, before the BoM reported that Pierre had peaked as a Category 2 tropical cyclone with 10-minute sustained winds of 95 km/h (60 mph) during 21 February.

[6][7] Later that day, the system made landfall in Shoalwater Bay and weakened below tropical cyclone intensity, before it moved back into the Coral Sea near Yeppoon.

[6][7] As Pierre moved south-eastwards parallel to the Queensland coast, it produced high seas, gale-force winds, minor flooding and minimal damage.

[6][8] During the middle of February, a cloud mass persisted for several days in the Arafura sea, to the north of the Arnhem Land in northern Australia.

[9] During 20 February the BoM reported that the cloud mass had developed a surface circulation and classified it as a tropical low, while it was located around 750 km (465 mi) to the north of Galiwin'ku.

[9] The newly named system peaked during 22 February as a category 1 tropical cyclone on the Australian scale, with 10-minute sustained winds of 75 km/h (45 mph).

[14] During 27 March, the BoM started to monitor a tropical low that had developed within the Intertropical Convergence Zone, about 700 km (435 mi) to the southeast of Port Moresby in Papua New Guinea.

[15][16] Over the next couple of days, the system moved westwards and gradually developed further, before the JTWC initiated advisories on the low and designated it as Tropical Cyclone 32P during 29 March.

[15] During 30 March, the BoM reported that Tanya had peaked with 10-minute sustained winds of 100 km/h (65 mph) and a minimum pressure of 982 hPa (29.00 inHg), which made it a category 2 tropical cyclone on the modern day Australian scale.

[15][16] The system subsequently made landfall near Coen on the Cape York Peninsula, at around 14:00 AEST (0400 UTC) on 1 April and rapidly weakened below tropical cyclone intensity.

[15][16] However, over the next couple of days, the JTWC continued to monitor Tanya's remnants as they moved across the Gulf of Carpentaria, before they made landfall and dissipated over the Arnhem Land during 4 April.

[19][21] Over the next couple of days, Gretel moved south-westwards parallel to the coastline of the Northern Territory, as upper-level windshear caused the systems low-level circulation centre to become displaced from the surrounding atmospheric convection.