2006–07 Australian region cyclone season

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2006–07 Australian region cyclone season
Season summary map
Seasonal boundaries
First system formed30 December 2006
Last system dissipated18 May 2007
Strongest storm
NameGeorge
 • Maximum winds205 km/h (125 mph)
(10-minute sustained)
 • Lowest pressure902 hPa (mbar)
Seasonal statistics
Tropical lows8
Tropical cyclones5
Severe tropical cyclones3
Total fatalities5
Total damage$15.7 million (2007 USD)
Related articles
Australian region tropical cyclone seasons
2004–05, 2005–06, 2006–07, 2007–08, 2008–09

The 2006–07 Australian region cyclone season was a below average tropical cyclone season. It began on 1 November 2006 and ended on 30 April 2007; however, Tropical Cyclone Pierre formed on 17 May, after the official end date. The regional tropical cyclone operational plan also defines a tropical cyclone year separately from a tropical cyclone season, which runs from 1 July 2006 to 30 June 2007.

Tropical cyclones in this area are monitored by four

Brisbane; and TCWC Port Moresby in Papua New Guinea.[1]

Systems

Cyclone GeorgeTropical cyclone scales#Comparisons across basins

Tropical Low Isobel

Tropical low (Australian scale)
Tropical storm (SSHWS)
 
Duration30 December – 5 January
Peak intensity85 km/h (50 mph) (10-min);
982 hPa (mbar)

An area of increased

Tropical Cyclone Warning Centre in Perth upgraded it to a tropical cyclone later that morning, naming it Isobel. The JTWC followed suit and designated the system Tropical Cyclone 07S. Isobel was downgraded to a tropical low shortly after landfall over the Eighty Mile Beach on 3 January and advisories were stopped at 0600 UTC that morning. The remnants of Isobel merged with a deep low-pressure system near the southern coast of Western Australia, dumping 100 mm of torrential rain, in what was dubbed a "perfect storm". The extratropical system halted mining operations and unleashed winds of up to 120 km/h.[2]

After the system dissipated, the BOM de-classified Isobel as a tropical cyclone as post-storm analysis showed that it did not have a well enough defined center to qualify as a tropical cyclone.[3]

Tropical Cyclone Nelson

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
 
Duration5 February – 7 February
Peak intensity95 km/h (60 mph) (10-min);
985 hPa (mbar)

On 30 January, a tropical low was identified by the

Cairns
on 6 February.

TCWC Brisbane Tropical Low

Tropical low (Australian scale)
 
Duration5 February – 8 February
Peak intensity85 km/h (50 mph) (10-min);
995 hPa (mbar)

Just east of the remnants of Nelson, a tropical low was detected on 6 February. The low absorbed the moisture from Nelson as it moved slowly away from the coast. On 7 February, the

TCWC in Brisbane
issued their last tropical cyclone advisory. In that advisory they noted that low would gradually intensify over the next 24 to 48 hours, however it was not expected to develop into a tropical cyclone until it was well away from the coast of Australia. On 8 February, the low continued to move to the east southeast but was in an unfavourable environment for intensification. The TCWC in Brisbane stopped issuing ocean wind warnings on the system on 9 February.

Tropical Low Humba

Tropical low (Australian scale)
 
Duration19 February – 20 February (exited basin)
Peak intensity75 km/h (45 mph) (10-min);
1000 hPa (mbar)

Tropical Low Odette

Tropical low (Australian scale)
 
Duration2 March – 5 March
Peak intensity75 km/h (45 mph) (10-min);
990 hPa (mbar)

On 2 March, the

Brisbane, Queensland noted the potential for redevelopment, and the remnants of Odette passed into the area of responsibility of RSMC Nadi
early the next day. However, redevelopment did not occur, and tropical disturbance advisories were discontinued.

Odette was subsequently downgraded below tropical cyclone intensity by the warning agency in Brisbane.[4]

Severe Tropical Cyclone George

Category 5 severe tropical cyclone (Australian scale)
Category 3 tropical cyclone (SSHWS)
 
Duration3 March – 10 March
Peak intensity205 km/h (125 mph) (10-min);
902 hPa (mbar)
Main article: Cyclone George

A tropical low that had been centered over land in the

Tropical Cyclone Warning Centre in Darwin initiated tropical cyclone advisories on 2 March while the low was still inland. The Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert
on the system later that day, and designated it Tropical Cyclone 17S the next day as it emerged into water.

Later on 3 March, TCWC Darwin upgraded the low to a tropical cyclone, naming it George, the first name used from the Darwin list since Fay in March 2004. George continued to strengthen, and was upgraded to a

Kimberley region of Western Australia on the western coast of the Joseph Bonaparte Gulf
. The tropical cyclone weakened and the BOM downgraded it to a tropical low after it moved over land, but this weakening was short lived however, as it almost immediately reintensified into a Category 1 tropical cyclone when it started to move off the Kimberley coast.

The Tropical Cyclone Warning Centre in

UTC) on that day while it was still at its peak intensity and a minimum pressure of 902 hPa
.

The

TCWC in Perth
issued its final warning.

Cyclone George was the most powerful cyclone to hit Port Hedland since Cyclone Joan in 1975.[5] Three people were killed and twenty-eight others were injured as a result of the severe cyclone.

Severe Tropical Cyclone Jacob

Category 3 severe tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
 
Duration3 March – 12 March
Peak intensity130 km/h (80 mph) (10-min);
971 hPa (mbar)

A tropical low formed in the

Tropical Cyclone Warning Centre in Perth named it Jacob as it intensified to tropical cyclone status. A cyclone watch was immediately issued for Christmas Island, as Jacob moved to the west northwest closer to the island. The Joint Typhoon Warning Center designated the system Tropical Cyclone 18S on the same day. Jacob was also upgraded to a Category 2 tropical cyclone by the TCWC in Perth. Jacob continued to strengthen into a Category 3 severe tropical cyclone on 8 March, but weakened shortly after back to a Category 2. Jacob slowed down its movement during the day and began to move eastward away from Christmas Island, therefore, cyclone warnings were cancelled. Jacob restrengthened to a Category 3 on 9 March and accelerated to the southeast towards the Australian mainland. After just being hit by Severe Tropical Cyclone George the night before, TCWC Perth began issuing cyclone watches for Cyclone Jacob for the entire Pilbara coast later that day. The next day, Jacob once again weakened to a Category 2 tropical cyclone. The Bureau of Meteorology forecast Jacob to intensify to a Category 3 cyclone again before landfall, but this did not materialise and Jacob instead weakened further to a Category 1 cyclone on 11 March. Jacob weakened into a tropical low shortly after making landfall east of Port Hedland, Western Australia
on 12 March.

Severe Tropical Cyclone Kara

Category 4 severe tropical cyclone (Australian scale)
Category 3 tropical cyclone (SSHWS)
 
Duration24 March – 28 March
Peak intensity195 km/h (120 mph) (10-min);
941 hPa (mbar)

On 24 March, TCWC Perth started issuing tropical cyclone advisories on a developing tropical low that had moved off land into waters off the

BOM upgraded it to Category 2 on the Australian scale later that day, then to a severe tropical cyclone early on 26 March. It then underwent rapid development, due to its small size and a favourable environment, and reached Category 3 severe tropical cyclone strength.[7]

At this point, the Bureau of Meteorology had high uncertainty regarding the cyclone's future track, which generally pointed Kara to move southwards towards the Western Australian coast. Therefore, cyclone watches and warnings were issued for the entire Pilbara coast, extending as far east as Broome. The cyclone reached peak intensity late on 26 March, and began to rapidly weaken the next day due to increasing wind shear.[7] The JTWC issued its last advisory on the evening of 27 March, and TCWC Perth followed suit early on 28 March as Kara dissipated near Eighty Mile Beach in Australia.

Tropical Cyclone Pierre

Category 1 tropical cyclone (Australian scale)
Tropical depression (SSHWS)
 
Duration16 May – 18 May
Peak intensity75 km/h (45 mph) (10-min);
990 hPa (mbar)
Main article: List of off-season Australian region tropical cyclones

Early on 16 May, slightly more than two weeks after the official end to the Australian cyclone season, the

Brisbane identified a tropical low east-southeast of Papua New Guinea. The low organised quickly in the Soloman Sea, and the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert on it several hours later. TCWC Brisbane named the system Tropical Cyclone Pierre early the next day. The JTWC issued its first advisory on Tropical Cyclone 24P several hours later, as the cyclone moved westward. Later that day, Pierre encountered increased wind shear and dry air, disrupting the system and inhibiting its development.[8] These unfavourable conditions eventually caused the system to lose its convection and degenerate into a tropical low shortly before making landfall in Papua New Guinea.[9] After that, Ex-Tropical Cyclone Pierre entered the northern part of the Coral Sea and threatened to produce heavy rainfall and thunderstorms with damaging wind gusts across Cape York Peninsula.[10]

Other systems

During 25 March, TCWC Brisbane started monitoring a tropical low that was located about 390 km (240 mi) to the south-west of Honiara in the Solomon Islands.[11] Over the next day the system moved south-eastwards in an area of low vertical wind shear and moved into the South Pacific basin where the Fiji Meteorological Service started monitoring it as Tropical Depression 13F.[11]

Storm names

TCWC Perth

  • Isobel
  • Jacob
  • Kara

TCWC Darwin

  • George

TCWC Brisbane

  • Nelson
  • Odette
  • Pierre

Season effects

Name Dates Peak intensity Areas affected Damage
(USD) 		Deaths Refs
Category Wind speed Pressure
Isobel 30 December – 5 January Tropical low 55 km/h (35 mph) 992 hPa (29.29 inHg) None None None
Nelson 5 – 7 February Category 2 tropical cyclone 95 km/h (60 mph) 985 hPa (29.09 inHg) Northern Territory, Queensland Unknown Unknown
Low 5 – 8 February Tropical low 85 km/h (50 mph) 995 hPa (29.38 inHg)
Odette 2 – 5 March Tropical low 75 km/h (45 mph) 990 hPa (29.23 inHg) None None
George 3 – 10 March Category 5 severe tropical cyclone 205 km/h (125 mph) 902 hPa (26.64 inHg) Western Australia $15.7 million 5
Jacob 3 – 12 March Category 3 severe tropical cyclone 130 km/h (80 mph) 958 hPa (28.29 inHg) Western Australia Minimal
Kara 23 – 30 March Category 3 severe tropical cyclone 155 km/h (100 mph) 948 hPa (27.99 inHg) None None
Pierre
 15 – 23 May 2007 Category 1 tropical cyclone 75 km/h (45 mph) 990 hPa (29.23 inHg) Solomon Islands, Papua New Guinea, Torres Straits Unknown Unknown [12][citation needed]
Season aggregates
8 systems 30 December – 23 May 205 km/h (125 mph) 902 hPa (26.64 inHg) $15.7 million 5

See also

References

  1. ^ http://www.wmo.ch/web/www/TCP/TCP24-English2004.pdf [dead link]
  2. ^ "Perfect Storm Australia-Bound". Straits Times. Singapore. Agence France-Presse and Singapore Press Holdings. 5 January 2007. p. 19.
  3. ^ Gary Padgett Monthly Global Tropical Cyclone Summary – January 2007
  4. ^ Shaik, Hakeem A; Cleland, Samuel J. "The tropical circulation in the Australian/Asian region – November 2006 to April 2007" (PDF). Bureau of Meteorology. Archived (PDF) from the original on 2 August 2019. Retrieved 28 May 2008. {{cite journal}}: Cite journal requires |journal= (help)
  5. ^ a b Tropical Cyclone Tropical Cyclone George Impacts
  6. ^ Tropical Cyclone Season Summary: Western Australian Region: 2006 – 2007. Bureau of Meteorology. Retrieved on 19 July 2015.
  7. ^ a b c "Archived copy". Archived from the original on 25 March 2007. Retrieved 17 June 2017.{{cite web}}: CS1 maint: archived copy as title (link)
  8. ^ "Archived copy". Archived from the original on 18 May 2007. Retrieved 17 June 2017.{{cite web}}: CS1 maint: archived copy as title (link)
  9. ^ "Archived copy". Archived from the original on 19 May 2007. Retrieved 17 June 2017.{{cite web}}: CS1 maint: archived copy as title (link)
  10. ^ "Archived copy". Archived from the original on 21 May 2009. Retrieved 28 January 2017.{{cite web}}: CS1 maint: archived copy as title (link) CS1 maint: bot: original URL status unknown (link)
  11. ^ a b RSMC Nadi — Tropical Cyclone Centre (8 December 2008). Tropical Cyclone Seasonal Summary 2006-07 (Report). Fiji Meteorological Service. Retrieved 30 August 2015.
  12. ^ "2007 Tropical Cyclone Pierre (2007136S10158)". International Best Track Archive for Climate Stewardship. Retrieved 25 May 2022.

External links

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