Cyclone Tracy

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Cyclone Tracy
Category 4 severe tropical cyclone (Aus scale)
Category 3 tropical cyclone (SSHWS)
Cyclone Tracy 25 December 1974 ESSA-8.png
Cyclone Tracy on 25 December 1974
Formed21 December 1974 (1974-12-21)
Dissipated26 December 1974 (1974-12-26)
Highest winds 10-minute sustained:175 km/h (110 mph)
1-minute sustained:205 km/h (125 mph)
Gusts:240 km/h (150 mph)
Lowest pressure950 hPa (mbar); 28.05 inHg
Fatalities71
Damage$645.35 million (1974 USD)
Areas affected Tiwi Islands, Northern Territory
Part of the 1974–75 Australian region cyclone season

Cyclone Tracy was a tropical cyclone that devastated the city of Darwin, Northern Territory, Australia from 24–26 December 1974. The storm was the second-smallest tropical cyclone on record, behind only Tropical Storm Marco in 2008.

Tropical cyclone Is a rotating storm system

A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain. Depending on its location and strength, a tropical cyclone is referred to by different names, including hurricane, typhoon, tropical storm, cyclonic storm, tropical depression, and simply cyclone. A hurricane is a tropical cyclone that occurs in the Atlantic Ocean and northeastern Pacific Ocean, and a typhoon occurs in the northwestern Pacific Ocean; in the south Pacific or Indian Ocean, comparable storms are referred to simply as "tropical cyclones" or "severe cyclonic storms".

Darwin, Northern Territory City in the Northern Territory, Australia

Darwin is the capital city of the Northern Territory of Australia, situated on the Timor Sea. It is the largest city in the sparsely populated Northern Territory, with a population of 145,916. It is the smallest, wettest and most northerly of the Australian capital cities, and acts as the Top End's regional centre.

Australia Country in Oceania

Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the largest country in Oceania and the world's sixth-largest country by total area. The neighbouring countries are Papua New Guinea, Indonesia and East Timor to the north; the Solomon Islands and Vanuatu to the north-east; and New Zealand to the south-east. The population of 25 million is highly urbanised and heavily concentrated on the eastern seaboard. Australia's capital is Canberra, and its largest city is Sydney. The country's other major metropolitan areas are Melbourne, Brisbane, Perth and Adelaide.

Contents

The small, developing easterly storm had been observed passing clear of the city initially, but then turned towards it early on 24 December. After 10:00 p.m. ACST, damage became severe, and wind gusts reached 217 kilometres per hour (134.84 mph) before instruments failed. Residents of Darwin were celebrating Christmas, and did not immediately acknowledge the emergency, partly because they had been alerted to an earlier cyclone (Selma) that passed west of the city. Additionally, news outlets had only a skeleton crew on duty over the holiday.

Time in Australia country with three main time zones

Australia uses three main time zones: Australian Western Standard Time, Australian Central Standard Time, and Australian Eastern Standard Time. Time is regulated by the individual state governments, some of which observe daylight saving time (DST). Australia's external territories observe different time zones.

Tracy killed 71 people, caused A$837 million in damage (1974 dollars), or approximately A$6.41 billion (2014 dollars), or $4.94 billion 2014 USD. It destroyed more than 70 percent of Darwin's buildings, including 80 percent of houses. [1] [2] It left more than 25,000 out of the 47,000 inhabitants of the city homeless prior to landfall and required the evacuation of over 30,000 people, [3] of whom many never returned. After the storm passed, the city was rebuilt using more stringent standards "to cyclone code".

Meteorological history

Map plotting the track and the intensity of the storm, according to the Saffir-Simpson scale Tracy 1974 track.png
Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale

On 20 December 1974, the United States' ESSA-8 environmental satellite recorded a large cloud mass centred over the Arafura Sea about 370 kilometres (230 mi) northeast of Darwin. This disturbance was tracked by the Darwin Weather Bureau's regional director Ray Wilkie, and by senior meteorologist Geoff Crane. On 21 December 1974, the ESSA-8 satellite showed evidence of a newly formed circular centre near latitude 8° south and longitude 135° east. [4] Crane - the meteorological duty officer at the time - issued the initial tropical cyclone alert describing the storm as a tropical low that could develop into a tropical cyclone.

United States Federal republic in North America

The United States of America (USA), commonly known as the United States or America, is a country comprising 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is slightly smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U.S. is the third most populous country. The capital is Washington, D.C., and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico. The State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean. The U.S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The extremely diverse geography, climate, and wildlife of the United States make it one of the world's 17 megadiverse countries.

ESSA-8

ESSA-8 was a weather satellite launched by the National Aeronautics and Space Administration (NASA) on December 15, 1968, from Vandenberg Air Force Base, California. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA).

Arafura Sea Marginal sea between Australia and Indonesian New Guinea

The Arafura Sea lies west of the Pacific Ocean, overlying the continental shelf between Australia and Indonesian New Guinea.

Later in the evening, the Darwin meteorological office received an infrared satellite image from the National Oceanic and Atmospheric Administration's satellite, NOAA-4, showing that the low pressure had developed further and that spiralling clouds could be observed. The storm was officially pronounced a tropical cyclone at around 10 p.m. on 21 December, when it was around 200 kilometres (120 mi) to the north-northeast of Cape Don (360 kilometres (220 mi) northeast of Darwin). [5] Cyclone Tracy was first observed on the Darwin radar on the morning of 22 December. [6] Over the next few days, the cyclone moved in a southwesterly direction, passing north of Darwin on 22 December. A broadcast on ABC Radio that day stated that Cyclone Tracy posed no immediate threat to Darwin. However, early in the morning of 24 December, Tracy rounded Cape Fourcroy on the western tip of Bathurst Island, and moved in a southeasterly direction, straight towards Darwin. [7] The bureau's weather station at Cape Fourcroy measured a mean wind speed of 120 kilometres per hour (75 mph) at 9:00 that morning. [8]

National Oceanic and Atmospheric Administration An American scientific agency within the US Department of Commerce that focuses on the oceans and the atmosphere

The National Oceanic and Atmospheric Administration is an American scientific agency within the United States Department of Commerce that focuses on the conditions of the oceans, major waterways, and the atmosphere.

NOAA-4

NOAA-4, also known as ITOS-G was a weather satellite operated by the National Oceanic and Atmospheric Administration (NOAA). It was part of a series of satellites called ITOS, or improved TIROS. NOAA-4 was launched on a Delta rocket on November 15, 1974. The launch carried two other satellites: AMSAT-OSCAR 7 and Intasat. It remained operational for 1463 days until it was deactivated by NOAA on November 18, 1978.

Cape Don Light lighthouse in Australia

Cape Don Light is an active lighthouse located on Cape Don, at the tip of the Cobourg Peninsula, Northern Territory, Australia, in Garig Gunak Barlu National Park, marking the entrance to the Dundas Strait. It is Australia's northernmost traditional lighthouse. The station served on the important route to Darwin, between the peninsula and Melville Island. The tower was constructed in 1915-1917, during the "Golden Age of Australian Lighthouses" (1913–1920), and the tower was manned until 1983. During the entire period that the tower was manned it also maintained meteorological records which were well placed to assist in cyclone development tracking. The complex consists of the lighthouse, three residences and ancillary buildings.

By late afternoon on 24 December, the sky over the city was heavily overcast, with low clouds, and was experiencing strong rain. [9] Wind gusts increased in strength; between 10 p.m (local time) and midnight, the damage became serious, and residents began to realise that the cyclone would not just pass by the city, but rather over it. On 25 December at around 3:30 a.m, Tracy's centre crossed the coast near Fannie Bay. [6] The highest recorded wind gust from the cyclone was 217 kilometres per hour (135 mph), which was recorded around 3:05 a.m at Darwin Airport. [6] The anemometer (wind speed instrument) failed at around 3:10 a.m, with the wind vane (wind direction) destroyed after the cyclone's eye. [6] The Bureau of Meteorology's official estimates suggested that Tracy's gusts had reached 240 kilometres per hour (150 mph). [10] The lowest air pressure reading during Tracy was 950 hectopascals (28 inHg), which was taken at around 4 a.m, by a Bureau staff member at Darwin Airport. [6] This was recorded during the eye of the cyclone. [6] From around 6:30 a.m, the winds began to ease, with the rainfall ceasing at around 8:30 a.m. [6]

Overcast meteorological condition of clouds obscuring at least 95% of the sky

Overcast or overcast weather, as defined by the World Meteorological Organization, is the meteorological condition of clouds obscuring at least 95% of the sky. However, the total cloud cover must not be entirely due to obscuring phenomena near the surface, such as fog.

Fannie Bay, Northern Territory Suburb of Darwin, the Northern Territory, Australia

Fannie Bay is a middle/inner suburb of the city of Darwin, Northern Territory, Australia.

Darwin International Airport international airport serving Darwin, Australia

Darwin International Airport is the busiest airport serving the Northern Territory and the tenth busiest airport in Australia. It is the only airport serving Darwin.

After making landfall, Tracy rapidly weakened, dissipating on 26 December. [6]

The relative sizes of the United States, Cyclone Tracy and Typhoon Tip, the second smallest and largest tropical storms ever recorded, respectively Typhoonsizes.jpg
The relative sizes of the United States, Cyclone Tracy and Typhoon Tip, the second smallest and largest tropical storms ever recorded, respectively

Preparations

Darwin had been severely battered by cyclones before; in January 1897 and again in March 1937. [11] However, in the 20 years leading up to Cyclone Tracy, the city had undergone a period of rapid expansion. E.P. Milliken estimated that on the eve of the cyclone there were 43,500 people living in 12,000 dwellings in the Darwin area. Though building standards at the time required that some attention be given to the possibility of cyclones, most buildings were not capable of withstanding the force of a cyclone's direct hit.

On the day of the cyclone, most residents of Darwin believed that the cyclone would not cause any damage to the city. Cyclone Selma had been predicted to hit Darwin earlier in the month, but it instead went north and dissipated without affecting Darwin in any way. As a result, Cyclone Tracy took most Darwin residents by surprise. Despite several warnings the people of Darwin did not evacuate or prepare for the cyclone. Many residents continued to prepare for Christmas, and many attended Christmas parties, despite the increasing winds and heavy rain. Journalist Bill Bunbury interviewed the residents of Darwin some time later and recorded the experiences of the survivors of the cyclone in his book Cyclone Tracy, picking up the pieces. [12] Resident Dawn Lawrie, a 1971 independent candidate for the electorate of Nightcliff, told him:

Another resident, Barbara Langkrens, said:

Impact

Devastation brought by Cyclone Tracy upon the Northern Territory city of Darwin.
Courtesy - National Archives of Australia A6135, K29/1/75/16 Cyclone tracy aerial view darwin.jpg
Devastation brought by Cyclone Tracy upon the Northern Territory city of Darwin.
Courtesy – National Archives of Australia A6135, K29/1/75/16
Houses after the destruction caused by Tracy Houses-after-tracy.jpg
Houses after the destruction caused by Tracy
House in Nakara, Northern suburbs, after Tracy House-after-tracy.jpg
House in Nakara, Northern suburbs, after Tracy
HMAS Arrow beached in Francis Bay March 1975 Hmas-attack.jpg
HMAS Arrow beached in Francis Bay March 1975
The base of a steel electricity pole bent by Tracy Power-pole-base.jpg
The base of a steel electricity pole bent by Tracy
Memorial at Casuarina High School assembled from three house girders twisted by Cyclone Tracy Three Twisted House Girders.jpg
Memorial at Casuarina High School assembled from three house girders twisted by Cyclone Tracy

Cyclone Tracy killed 71 people. [1] Two Australian Navy RAN sailors died when HMAS Arrow, an Attack-class patrol boat, sank at Stokes Hill Wharf. [13] The storm also caused the substantial destruction of the city of Darwin. At Darwin Airport, thirty-one aircraft were destroyed and another twenty-five badly damaged. [14] The initial estimate put the reported death toll at 65, but it was revised upwards in March 2005 to 71, when the Northern Territory Coroner proclaimed that those six who still remained listed as missing had "perished at sea". [1] [3]

Several factors delayed the dissemination of the news of the cyclone's impact. The destruction of transportation infrastructure and the distance between Darwin and the rest of the Australian population played a role, as did the fact the storm made landfall on Christmas Day and most media outlets had only a skeleton crew rostered on at best. Most Australians were not aware of the cyclone until late in the afternoon. Dick Muddimer, a reporter for the local ABC station, 8DR, was able to travel through the wreckage to local television station NTD and had the ABC station in Mount Isa, Queensland notify ABC headquarters in Sydney that Darwin had been hit by a cyclone. [15]

In order to provide the initial emergency response, a committee was created. The committee, composed of several high-level public servants and police, stated that, "Darwin had, for the time being, ceased to exist as a city". Gough Whitlam, the Australian Prime Minister, was touring Syracuse, Sicily at the time and flew to Darwin upon hearing of the disaster. Additionally, the Australian government began a mass evacuation by road and air; all of the Defence Force personnel throughout Australia, along with the entire Royal Australian Air Force's fleet of transport planes, were recalled from holiday leave and deployed to evacuate civilians from Darwin, as well as to bring essential relief supplies to the area. Thirteen ships of the Royal Australian Navy were used to transport supplies to the area as part of Operation Navy Help Darwin; the largest humanitarian or disaster relief operation ever performed by the Navy. [16]

Health and essential services crisis

As soon as the worst of the storm had passed, Darwin faced several immediate health crises. On Christmas Day, the Darwin Hospital treated well over five hundred patients, with 112 of these being admitted into the hospital, and both of the facility's operating theatres being utilised. The first casualties did not arrive till 7 a.m. because of high winds and severe road conditions in and around the Darwin area. Operating continued throughout the night and into the early morning. Local teams worked without relief until the arrival of a surgical team from Canberra late that day. Those who were considered unable to return to work within two weeks were evacuated by air to safer locations.

All official communications out of Darwin were no longer operational. The antennas at the OTC Coastal Radio Service station (callsign VID) were destroyed during the storm. Station manager Bob Hooper, who was an amateur radio operator, helped to establish communications using his own equipment. By 10 a.m. Gary Gibson, another amateur operator, was able to establish a station at the Darwin Community College, and within a short period of time a network of stations was established across the country. This network, coordinated by Melbourne D24 police, provided message services to the cities of Perth, Melbourne, Sydney, Canberra, Townsville, Brisbane, Adelaide, Alice Springs, Gove, Mt Isa, Cairns, Rockhampton, MacKay, Lismore, and Cooma. [17] By 10:40 a.m. VID operators had established VID2 on board the MV Nyanda in Darwin Harbour, and then for five days official communications traffic in and out of Darwin was handled via continuous wave radio (Morse code). The only local radio station that wasn't completely disabled was the ABC's 8DR. For the next two days, it was Darwin's only link to the outside world, and was on the air for all but 34 hours in the coming weeks. [15]

Those who remained in Darwin faced the threat of several diseases due to much of the city being without water, electricity or basic sanitation. An initial response was to vaccinate residents for typhoid and cholera. Approximately 30,000 people were homeless, and were forced to seek shelter in several makeshift housing and emergency centres that lacked proper hygienic conditions. Volunteers came in from across the country to assist with the emergency relief efforts. Trench latrines were dug; water supplies delivered by tankers, and mass immunisation programs begun. The army was given the task of searching houses for bodies of people and animals, as well as locating other health risks; for example, cleaning out rotting contents from fridges and freezers across the city. This was completed within a week. Houses which had been 'searched and cleared' had S&C painted on an external wall. The city itself was sprayed with malathion to control mosquitoes and other similar pests.

Attempts to reconnect the essential services to the city began on Christmas Day. Local officers from the Commonwealth Department of Housing and Construction began clearing debris and working to restore power. They sealed off damaged water hydrants and activated pumps to reactivate the city's water and sewerage systems.

Evacuation and the public response

Major-General Alan Stretton, Director-General of the Natural Disasters Organisation, [7] and the Commonwealth Minister for the Northern Territory, Rex Patterson, arrived at Darwin Airport late on Christmas Day and took charge of the relief efforts. After an assessment of the situation and meetings with the Department of the Northern Territory and the relevant minister, it was concluded that Darwin's population needed to be reduced to a "safe level" of 10,500 people. This decision was made on the advice of Dr. Charles Gurd, the Director of Health in the Northern Territory. Around 10,000 people left Darwin and the surrounding area within the first two days, but the rate of departures then began to slow down. The government then gave support to his position, offering full reimbursement of personal costs, as long as the evacuation took place.

The population was evacuated by air and ground; because of communications difficulties with Darwin airport, landing was limited to one plane every ninety minutes. At major airports, teams of federal and territory department officials as well as Salvation Army and Red Cross workers met refugees, with the Red Cross taking responsibility for keeping track of the names and temporary addresses of the refugees. Evacuations were prioritised according to need; women, children, and the elderly and sick were evacuated first. There were reports of men dressing up as women to escape with the early evacuations. Between 26 and 31 December, a total of 35,362 people were evacuated from Darwin. [3] [14] Of those, 25,628 were evacuated by air, the remainder by road. [3] [14] By 31 December, only 10,638 people (mostly men who were required to help clean up the city) remained in Darwin. Stretton also regulated access to the city by means of a permit system. Permits were only issued to those who were involved in either the relief or reconstruction efforts, and were used to prevent the early return of those who had been evacuated.

Upon receiving news of the damage, several community groups across Australia began fundraising and relief efforts to assist the survivors. Major reception centres were set up in cities such as Katherine, Tennant Creek and Alice Springs. Several of the small towns along the Stuart Highway made efforts to assist people who were fleeing by road, supplying them with food, fuel, rest and mechanical aid. At Adelaide River, the small local population provided hot meals to the refugees who stopped there. Approximately twenty-four hours after the storm hit Darwin, the population of Alice Springs had raised over $105,000 to assist the victims of Tracy. [18] In Melbourne at the Boxing Day Test cricket match between Australia and England, members of both teams moved around the boundaries carrying buckets which the crowd threw cash into for the relief funds. Darwin families were also given priority on public housing waiting lists. On 31 December 1974, Stretton recommended that full civilian control should resume in Darwin, and handed over control of the city to its elected officials.

Aftermath

Reconstruction and effects on Darwin

In February 1975, Prime Minister Gough Whitlam announced the creation of the Darwin Reconstruction Commission, which was given the task of rebuilding the city "within five years", focusing primarily on building houses. [19] The Commission was headed by Tony Powell. [20] The damage to the city was so severe that some advocated moving the entire city. However, the government insisted that it be rebuilt in the same location. By May 1975, Darwin's population had recovered somewhat, with 30,000 residing in the city. Temporary housing, caravans, hotels and an ocean liner, MV Patris, were used to house people, as reconstruction of permanent housing had not yet begun by September that year. Ella Stack became Mayor of Darwin in May 1975 and was heavily involved in its reconstruction.

However, by the following April, and after receiving criticism for the slow speed of reconstruction, the Commission had built 3,000 new homes in the nearly destroyed northern suburbs, and completed repairs to those that had survived the storm. Several new building codes were drawn up, trying to achieve the competing goals of the speedy recovery of the area and ensuring that there would be no repeat of the damage that Darwin took in 1974. By 1978, much of the city had recovered and was able to house almost the same number of people as it had before the cyclone hit. However, by the 1980s, as many as sixty percent of Darwin's 1974 population had left, never to return. In the years that followed, Darwin was almost entirely rebuilt and now shows almost no resemblance to the pre-Tracy Darwin of December 1974.

Although a Legislative Assembly had been set up earlier in the year, the Northern Territory had only minimal self-government, with a federal minister being responsible for the Territory from Canberra. However, the cyclone and subsequent responses highlighted several problems with the way the regional government was set up. This led Malcolm Fraser, Whitlam's successor as Prime Minister, to give self-government to the Territory in 1978.

Many of the government records associated with Cyclone Tracy became publicly available on 1 January 2005 under the 30 year rule.

Cyclone Tracy inspired the song "Santa Never Made It into Darwin", composed by Bill Cate and performed by Bill and Boyd in 1975 to raise money for the relief and reconstruction efforts. [21] [22] In 1983 Hoodoo Gurus released "Tojo", a song comparing the Japanese bombing of Darwin under the command of Hideki Tojo during World War II to the damage done by Cyclone Tracy. The much feared Japanese invasion never happened, but the cyclone was virtually ignored and ended up destroying the city. [23] In May 1976, Australian band Ayers Rock released the single "Song for Darwin", also as a fund raiser for the relief and reconstruction efforts.

In 1986, the Nine Network and PBL created Cyclone Tracy , a period drama mini-series based on the events during the cyclone. Michael Fisher, Ted Roberts and Leon Saunders wrote the series, and it starred Chris Haywood and Tracy Mann, who played the lead characters of Steve and Connie. [24] The mini-series was released on DVD by Umbrella Entertainment in December 2005. The DVD is compatible with all region codes and includes special features such as newsreel footage of the devastation and a documentary titled On A Wind And A Prayer. [25]

Records and meteorological statistics

Tracy is the most compact cyclone or equivalent-strength hurricane on record in the Australian basin and Southern Hemisphere, with gale-force winds extending only 48 kilometres (30 mi) from the centre, and was also the smallest tropical cyclone worldwide until 2008, when Tropical Storm Marco of the 2008 Atlantic hurricane season broke the record, with gale-force winds extending only 19 kilometres (12 mi) from the centre. [26] [27] After forming over the Arafura Sea, the storm moved southwards and affected the city with Category 4 winds on the Australian cyclone intensity scale, while there is evidence to suggest that it had reached Category 3 on the Saffir-Simpson Hurricane Scale when it made landfall. [28] Bruce Stannard of The Age stated that Cyclone Tracy was a "disaster of the first magnitude ... without parallel in Australia's history." [29]

See also

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The 2013–14 Australian region cyclone season was a slightly below-average tropical cyclone season, with 10 tropical cyclones occurring within the Australian region. It officially started on 1 November 2013, and ended on 30 April 2014. The regional tropical cyclone operational plan defines a "tropical cyclone year" separately from a "tropical cyclone season"; the "tropical cyclone year" began on 1 July 2013 and ended on 30 June 2014.

Cyclone Alessia

Tropical Cyclone Alessia was the first tropical cyclone to affect the Northern Territory of Australia in November since Cyclone Joan in 1975. The storm was first identified as a tropical low on 20 November 2013 well to the northwest of Australia. Tracking generally west to west-southwest, the small system steadily organized into a tropical cyclone by 22 November. Maintaining a small central dense overcast, Alessia brushed the Kimberley region before making landfall in the Top End region with winds of 65 km/h (40 mph) on 23 and 24 November respectively. Some weakening took place as the system moved over land; however, reorganization occurred as it neared the Gulf of Carpentaria. After moving over water on 26 November, it redeveloped gale-force winds. Alessia reached its peak intensity on 27 November with winds of 85 km/h (50 mph) and a barometric pressure of 991 mbar and subsequently made its final landfall near Wollogorang. Weakening ensued once more as the storm traveled over land; though, Alessia's remnants looped eastward back over water before doubling back to the west. The system was last noted moving inland again over the Northern Territory on 1 December.

Cyclone Gillian

Severe Tropical Cyclone Gillian was the second most powerful of the 2013–14 Australian region cyclone season and the strongest in the basin in four years. It developed on 8 March, 2014, in the Gulf of Carpentaria offshore northern Australia. It drifted southeastward, moving over northwestern Queensland on 10 March as a weak tropical cyclone, and subsequently turned to the southwest and later to the west. Unfavourable wind shear, land interaction, and dry air prevented much restrengthening, and for several days, Gillian was a weak tropical low. The storm moved northward and curved westward around the Top End of northwestern Australia, and subsequently moved across several islands in Indonesia, first Timor on 18 March. On 21 March, Gillian again became a tropical cyclone as it moved away from Indonesia. On the next day, it passed just southeast of Christmas Island as an intensifying storm, and subsequently Gillian underwent rapid deepening. On 23 March, the Bureau of Meteorology (BoM) estimated peak 10-minute sustained winds of 220 km/h (140 mph). On the same day, the Joint Typhoon Warning Center (JTWC) estimated peak 1-minute sustained winds of 260 km/h (160 mph), making it a Category 5 on the Saffir–Simpson hurricane wind scale. Increased wind shear caused the cyclone to rapidly weaken, and both BoM and JTWC discontinued advisories on Gillian on 26 March.

Cyclone Lam

Cyclone Lam was the strongest storm to strike Australia's Northern Territory since Cyclone Monica in 2006. It formed from the monsoon trough on February 12 in the Coral Sea. For much of its duration, the system moved westward due to a ridge to the south. The system crossed over the Cape York Peninsula and moved into the Gulf of Carpentaria, whereupon it gradually organized due to warm waters and favorable outflow. On February 16, the Bureau of Meteorology (BoM) classified it as a Category 1 on the Australian tropical cyclone intensity scale and gave it the name Lam. The storm intensified further while drifting toward the Wessel Islands, developing an eye and strengthening to the equivalence of a minimal hurricane on February 18. It strengthened to reach maximum sustained winds of 185 km/h (115 mph) early on February 19 before turning to the southwest, making it a Category 4 cyclone. That day, it made landfall on Northern Territory between Milingimbi and Elcho Island at peak intensity, and it rapidly weakened over land. About six hours after Lam moved ashore, Cyclone Marcia struck Queensland as a Category 5 cyclone, marking the first time on record that two storms of Category 4 intensity struck Australia on the same day.

Cyclone Marcus

Severe Tropical Cyclone Marcus was a very powerful tropical cyclone that struck Australia's Northern Territory and the Kimberley region of Western Australia in March 2018. It was the strongest tropical cyclone of the 2017–18 Australian region cyclone season, as well as the strongest tropical cyclone in the Australian region basin since George in 2007. It was also considered the worst cyclone to hit Darwin since Tracy in 1974.

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