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2017–18 Australian region cyclone season
Season summary map
Seasonal boundaries
First system formed	8 August 2017
Last system dissipated	Season ongoing
Strongest storm
Name	Dahlia
• Maximum winds	95 km/h (60 mph) (10-minute sustained)
• Lowest pressure	985 hPa (mbar)
Seasonal statistics
Tropical lows	8
Tropical cyclones	3
Severe tropical cyclones	0
Total fatalities	41 total
Total damage	Unknown
Related articles
2017–18 South-West Indian Ocean cyclone season 2017–18 South Pacific cyclone season
Australian region tropical cyclone seasons 2015–16, 2016–17, 2017–18, 2018–19, 2019–20

The 2017–18 Australian region cyclone season is a period of tropical cyclone formation in the Southern Indian Ocean and Pacific Oceans, between 90°E and 160°E. The season officially began 1 November 2017 and will end on 30 April 2018; however, tropical cyclones can form at any time of the year, as demonstrated by the first tropical low of the season in early August. Any tropical system that forms between 1 July 2017 and 30 June 2018 will count towards the season total. During the season, tropical cyclones will be officially monitored by one of the five tropical cyclone warning centres (TCWCs) that operate in this region. Three of the five centres are operated by the Australian Bureau of Meteorology (BOM) in Perth, Darwin and Brisbane, while the other two are operated by the National Weather Service of Papua New Guinea in Port Moresby and the Indonesian Agency for Meteorology, Climatology and Geophysics in Jakarta. The Joint Typhoon Warning Center (JTWC) of the United States and other national meteorological services including Météo-France at Réunion will also monitor the basin during the season.

Seasonal summary

Systems

Tropical Cyclone Cempaka

Category 1 tropical cyclone (Australian scale)
Duration	22 November – 1 December
Peak intensity	65 km/h (40 mph) (10-min); 998 hPa (mbar)

On 22 November, TCWC Perth and TCWC Jakarta started to monitor a weak tropical low that had developed about 332 km (206 mi) south of the city of Surabaya. By 06:00 UTC of 26 November, TCWC Jakarta began issuing advisories and was classified as a tropical depression. The JTWC, however, issued a Tropical Cyclone Formation Alert early on 27 November, stating that satellite imagery depicted flaring convection near its center. Several hours later, TCWC Jakarta upgraded the system to a tropical cyclone, giving the name Cempaka. Winds from the cyclone also blew ash from nearby Mount Agung on Bali westwards to its popular beaches and far eastern Java. On 30 November, Cempaka weakened into a tropical low, while turning to the southwest. TCWC Perth last mentioned Cempaka on 1 December.

Although Cempaka never made landfall, the rainfall from the storm caused severe flooding and landslides across the southern half of Java and Bali, killing at least 41 people and destroying many homes and businesses.

Tropical Cyclone Dahlia

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	24 November – 5 December
Peak intensity	95 km/h (60 mph) (10-min); 985 hPa (mbar)

Tropical Low 03U was first noted as a tropical depression by TCWC Jakarta on 24 November, while it was located about 1,500 km (930 mi) to the west of Jakarta, Indonesia. By 29 November, TCWC Jakarta upgraded the system to a tropical cyclone, receiving the name Dahlia, making it the first time where two cyclones were formed and named by TCWC Jakarta in a single season. The JTWC followed suit the next day, designating the system as 01S. By 1 December, Dahlia intensified into a Category 2 tropical cyclone, and reached its peak intensity six hours later with a minimum barometric pressure of 985 hPa. Dahlia maintained its intensity for several hours until the storm moved southeastwards and began to weaken. The BoM later issued its final bulletin on Dahlia early on 4 December. TCWC Perth last monitored on Dahlia on 5 December.

Tropical Cyclone Hilda

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	24 December – 30 December
Peak intensity	85 km/h (50 mph) (10-min); 985 hPa (mbar)

Hilda made landfall close to Anna Plains on 28 December as a category 1 cyclone. Wind and flooding damage was reported along the coast in Broome.

Tropical Low 07U

Tropical low (Australian scale)
Duration	1 January – 2 January
Peak intensity	Winds not specified; 1006 hPa (mbar)

Tropical Low 08U

Category 1 tropical cyclone (Australian scale)
Duration	3 January – Present
Peak intensity	75 km/h (45 mph) (10-min); 1000 hPa (mbar)

Other systems

On 8 August, TCWC Perth started to monitor a tropical low located approximately 850 km (530 mi) to the west-northwest of the Cocos Islands, on the 90th meridian east—the western edge of the BOM's area of responsibility. The tropical low moved in a west-southwesterly direction and attained 35 km/h (25 mph) sustained winds south of the circulation center, and a minimum barometric pressure of 1005 hPa (29.68 inHg). The storm moved out of the Australian region on the same day. On 24 November, TCWC Darwin started to monitor a weak tropical low that had developed in the Banda Sea. The system moved in a slow direction, and attained a minimum pressure of 1005 hPa, until it was last mentioned on 29 November. On 1 December, a tropical low formed to the south of Java. The tropical low rapidly moved southwestward, before dissipating the next day.

Storm names

Bureau of Meteorology

Since the start of the 2008–09 season, there has only been one list from which the Bureau of Meteorology has assigned tropical cyclone names despite the fact that three different warning centres are operated (in Perth, Darwin and Brisbane). These warning centres monitor all tropical cyclones that form within the Australian region, as well as any in the areas of responsibility of either TCWC Jakarta or TCWC Port Moresby. The next 12 names on the naming list are shown below.

TCWC Jakarta

TCWC Jakarta monitors Tropical Cyclones from the Equator to 11°S and from 90°E to 145°E. Should a tropical depression reach tropical cyclone strength within TCWC Jakarta's area of responsibility then it will be assigned the next name from the following list.

TCWC Port Moresby

Tropical cyclones that develop north of 11°S between 151°E and 160°E are assigned names by the TCWC Port Moresby. Tropical cyclone formation in this area is rare, with no cyclones being named in it since 2007. As names are assigned in a random order, the whole list is shown below.

Season effects

See also

• List of Southern Hemisphere cyclone seasons
• Atlantic hurricane seasons: 2017, 2018
• Pacific hurricane seasons: 2017, 2018
• Pacific typhoon seasons: 2017, 2018
• North Indian Ocean cyclone seasons: 2017, 2018
• 2017–18 South-West Indian Ocean cyclone season
• 2017–18 South Pacific cyclone season

Notes

References

1. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Saturday 25 November 2017". Australian Bureau of Meteorology. 22 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
2. "BULETIN INFORMASI SIKLON TROPIS Depresi Tropis 95S". Badan Meteorologi Klimatologi Dan Geofisika. 26 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
3. http://www.webcitation.org/6vILNfd38
4. "BULETIN INFORMASI SIKLON TROPIS Siklon Tropis CEMPAKA". Badan Meteorologi Klimatologi Dan Geofisika. 27 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
5. "Bali volcano WARNING: Cyclone blowing HAZARDOUS ash across Indonesia". 29 November 2017.
6. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Sunday 3 December 2017". Australian Bureau of Meteorology. 30 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
7. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Monday 4 December 2017". 1 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
8. ^ "Indonesia cyclone death toll reaches 41". The Borneo Post/AFP. 7 December 2017. Retrieved 7 December 2017.
9. http://www.webcitation.org/6vK8rd8wP
10. "Siklon Tropis DAHLIA". Badan Meteorologi Klimatologi Dan Geofisika. 29 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
11. "Tropical Cyclone 01S (Dahlia) Warning Nr 001". Joint Typhoon Warning Center. 30 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
12. "Trpical Cyclone Dahlia". Australian Bureau of Meteorology. 1 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
13. "Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 1 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
14. "Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 2 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
15. "Ex-Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 4 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
16. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Friday 8 December 2017". Australian Bureau of Meteorology. 5 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help); line feed character in |title= at position 48 (help)
17. ^ "WebCite query result". www.webcitation.org. Archived from the original on 2017-08-08. Retrieved 2017-08-08. {{cite web}}: Cite uses generic title (help); Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
18. Meteorology, corporateName=Bureau of. "Tropical Cyclones". www.bom.gov.au. Retrieved 2017-08-08.
19. "Meteo-France Tropical Bulletin (8 August 2017)" (PDF).
20. ^ "WebCite query result". www.webcitation.org. Archived from the original on 2017-08-08. Retrieved 2017-08-08. {{cite web}}: Cite uses generic title (help); Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
21. "Updated Tropical Cyclone Outlook for the Northern Region, including the Gulf of Carpentaria for the period until midnight CST Monday 27 November 2017". Australian Bureau of Meteorology. 24 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
22. "Updated Tropical Cyclone Outlook for the Northern Region, including the Gulf of Carpentaria for the period until midnight CST Saturday 2 December 2017". Australian Bureau of Meteorology. 29 November 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
23. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Monday 4 December 2017". Australian Bureau of Meteorology. 1 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
24. "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Tuesday 5 December 2017". Australian Bureau of Meteorology. 2 December 2017. {{cite web}}: |archive-date= requires |archive-url= (help)
25. ^ "Tropical Cyclone Operational plan for the South Pacific & Southeast Indian Ocean, 2014 Edition" (PDF). WMO. Retrieved 2016-06-12.
26. Gary Padgett (2008). "Monthly Global Tropical Cyclone Summary October". Australian Severe Weather. Archived from the original on 2013-07-04. Retrieved 2013-07-01. {{cite web}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (help)

External links

• Australian Bureau of Meteorology
• Joint Typhoon Warning Center
• Tropical Cyclone Warning Center Jakarta Template:Id
• Tropical Cyclone Warning Center Port Moresby

v t e Tropical cyclones of the 2017–18 Australian region cyclone season
	TL01U 1Cempaka 2Dahlia TL04U TL05U 2Hilda TL07U 1Irving 1Joyce TL10U TL11U TL12U TLFehi TL14U TL15U 3Kelvin TL18U 1Linda 5Marcus 3Nora TL23U 2Iris 1Flamboyan
Category

• Australian region cyclone seasons