1997–98 Australian region cyclone season

[2][3] Over the next couple of days, Nute weakened significantly as it encountered dry air and an increasing amount of vertical wind shear, which caused its low-level circulation to become fully exposed.

[4] As a result, the JTWC issued its final advisory on the system during November 20, before the BoM reported that Nute had dissipated during the following day.

A low-pressure system formed over the Northern Territory in late December and moved into the Timor Sea as the monsoon trough developed near Australia.

The low remained quasi-stationary to a couple of days near Townsville, causing major flooding in the area.

[8] Tropical Cyclone Selwyn formed 650 kilometers east-southeast of Christmas Island within the monsoon trough.

Selwyn went at a west-southwesterly motion, bringing it to a position almost 1,000 nautical miles (2,000 km) west of Broome by mid-day 29 December.

[9] During 1 January, TCWC Brisbane started to monitor a tropical low, that had developed within the monsoon trough about 630 km (390 mi) to the east-northeast of Cairns in Queensland, Australia.

On 9 January, Cyclone Katrina threatened Vanuatu when it stalled about 200 nautical miles (370 km) west-northwest of Port Vila and reversed direction and moved west due a high pressure system.

During that time, Katrina briefly reached Category 1 strength once more before slowing down and being affected by wind shear.

The storm moved westward reaching Category 1 status before making landfall on the eastern gulf coast of the Northern Territory.

Moving back out over the Timor Sea, Les hugged the coast and regained strength before making a second landfall and dissipating.

An LNG tanker reported 40 knot winds near the center during the late afternoon of 10 February, and the storm was named Victor that night.

As Victor accelerated towards a west-southwestern direction on the edge of a subtropical high, it crossed the 90th meridian east early on 16 February, and was subsequently briefly renamed by Mauritius as Tropical Cyclone Cindy.

[16] Later that day, the Regional Specialised Meteorological Centre in Réunion (RSMC La Reunion) downgraded Cindy to tropical disturbance intensity.

Nathan started off developing rapidly, the first warning, issued on 21 March, classified the system as a 45 mph (72 km/h) tropical cyclone.

Nathan was a small system in an environment of weak steering flow, causing the storm to move erratically but slowly to the east.

The TCWC in Brisbane kept Nathan's wind speed at 50-60 mph, whereas the Joint Typhoon Warning Center boosted it up to hurricane-strength on 23 March.

Nathan turned to the south and the Brisbane TCWC downgraded the system into a tropical low, ceasing advisories.

During 25 March the JTWC, RSMC Nadi and TCWC Brisbane reported that Cyclone Yali had moved into the Australian region from the South Pacific basin.

Tropical cyclones are named if they are non-frontal low pressure systems of synoptic scale developing over warm waters, or if Dvorak intensity analysis indicate the presence of gale force or stronger winds near the centre.

[23] Each Australian Tropical Cyclone Warning Centre (Perth, Darwin, and Brisbane) maintains a list of names arranged alphabetically and alternating male and female.

[23] Perth Darwin Brisbane The Bureau of Meteorology retired the names Katrina and Sid, replacing them with Kitty and Samuel respectively.