2017–18 Australian region cyclone season

2017–18 Australian region cyclone season
2017-2018 Australian region cyclone season summary.png
Season summary map
Seasonal boundaries
First system formed 8 August 2017
Last system dissipated Season ongoing
Strongest storm
Name Hilda
 • Maximum winds 95 km/h (60 mph)
(10-minute sustained)
 • Lowest pressure 980 hPa (mbar)
Seasonal statistics
Tropical lows 12
Tropical cyclones 5
Severe tropical cyclones 0
Total fatalities 41 total
Total damage Unknown
Related articles
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[]

Tropical cyclone scales#Comparisons across basins

Systems[]

Tropical Cyclone Cempaka[]

Category 1 tropical cyclone (Australian scale)
Cempaka 2017-11-27 0550Z.jpg Cempaka 2017 track.png
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.[1] By 06:00 UTC of 26 November, TCWC Jakarta began issuing advisories and was classified as a tropical depression.[2] The JTWC, however, issued a Tropical Cyclone Formation Alert early on 27 November, stating that satellite imagery depicted flaring convection near its center.[3] Several hours later, TCWC Jakarta upgraded the system to a tropical cyclone, giving the name Cempaka.[4] Winds from the cyclone also blew ash from nearby Mount Agung on Bali westwards to its popular beaches and far eastern Java.[5] On 30 November, Cempaka weakened into a tropical low, while turning to the southwest.[6] TCWC Perth last mentioned Cempaka on 1 December.[7]

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.[8]

Tropical Cyclone Dahlia[]

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Dahlia 2017-11-30 0636Z.jpg Dahlia 2017 track.png
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.[9] 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.[10] The JTWC followed suit the next day, designating the system as 01S.[11] By 1 December, Dahlia intensified into a Category 2 tropical cyclone,[12] and reached its peak intensity six hours later with a minimum barometric pressure of 985 hPa.[13] Dahlia maintained its intensity for several hours until the storm moved southeastwards and began to weaken.[14] The BoM later issued its final bulletin on Dahlia early on 4 December.[15] TCWC Perth last monitored on Dahlia on 5 December.[16]

Tropical Cyclone Hilda[]

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Hilda 2017-12-28 Suomi NPP.jpg Hilda 2017 track.png
Duration 26 December – 30 December
Peak intensity 95 km/h (60 mph) (10-min)  980 hPa (mbar)

During 26 December, the BoM reported that a tropical low had developed just off the Kimberley coast, about 330 km (205 mi) to the north of Derby.[17] The system subsequently moved south-southwest parallel to the coast, as it developed further before it moved overland to the southwest of Cape Leveque.[17] The system was subsequently classified as a Category 1 tropical cyclone and named Hilda by the BoM, while it was located inland near Broome based on reports of persistent gale force winds from Broome Airport.[17] After moving back over water, the system was classified as a Category 2 tropical cyclone with 10-minute peak windspeeds of 95 km/h (60 mph).[17] Hilda made landfall close to Anna Plains on 28 December as a category 2 cyclone. Wind and flooding damage was reported along the coast in Broome.

Tropical Cyclone Irving[]

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Irving 2018-01-05 0735Z.jpg Irving 2018 track.png
Duration 3 January – 6 January (Exited basin)
Peak intensity 75 km/h (45 mph) (10-min)  993 hPa (mbar)

On 3 January, a tropical low had developed to the southwest of Sumatra.[18] On 06:00 UTC of 5 January, TCWC Perth began issuing advisories on the system, using the identifier 08U.[19] TCWC Perth had recorded winds of 75 km/h (45 mph), despite the system did not have the structure of a tropical cyclone.[19] By the next day, 08U then strengthened into a Category 1 tropical cyclone, with the BoM receiving the name Irving, the fourth named storm of the season.[20] Three hours later, the JTWC followed suit and gave the designation 04S.[21] TCWC Perth, however, issued its final advisory as Irving exited the basin on 12:00 UTC of the same day.[22]

Tropical Cyclone Joyce[]

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Joyce 2018-01-12 0536Z.jpg Joyce 2018 track.png
Duration 6 January – 14 January
Peak intensity 85 km/h (50 mph) (10-min)  982 hPa (mbar)

Joyce made landfall in the Pilbara Coast on 12 January. The remnants of Cyclone Joyce bought heavy rain to the Perth Metro Area on January 15, a total of 96mm (3.77 in) of rain in 24 hours fell in Perth, while Rottnest Island recorded the highest amount of rain in the metro, which was a total of 142mm (5.59 in).[23]

Tropical Low[]

Tropical low (Australian scale)
Temporary cyclone south.svg 
Duration 6 January – 7 January
Peak intensity Winds not specified 

Tropical Low[]

Tropical low (Australian scale)
Temporary cyclone south.svg 
Duration 14 January – 19 January
Peak intensity Winds not specified 

Tropical Low[]

Tropical low (Australian scale)
Temporary cyclone south.svg 
Duration 20 January – Present
Peak intensity Winds not specified  999 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.[24][25] The tropical low moved in a west-southwesterly direction[24] and attained 35 km/h (25 mph) sustained winds south of the circulation center,[26] and a minimum barometric pressure of 1005 hPa (29.68 inHg).[27] The storm moved out of the Australian region on the same day.[27] On 24 November, TCWC Darwin started to monitor a weak tropical low that had developed in the Banda Sea.[28] The system moved in a slow direction, and attained a minimum pressure of 1005 hPa, until it was last mentioned on 29 November.[29] On 1 December, a tropical low formed to the south of Java.[30] The tropical low rapidly moved southwestward, before dissipating the next day.[31]

On 1 January, TCWC Perth began to track a small, weak tropical low to the south of Bali.[32] The system was last mentioned the next day.[33]

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).[34] 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.

Hilda Irving Joyce Kelvin (unused) Linda (unused) Marcus (unused)
Nora (unused) Owen (unused) Penny (unused) Riley (unused) Savannah (unused) Trevor (unused)

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.[34]

Cempaka Dahlia Flamboyan (unused) Kenanga (unused) Lili (unused)
Mangga (unused) Seroja (unused) Teratai (unused) Anggrek (unused) Bakung (unused)

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.[35] As names are assigned in a random order, the whole list is shown below.

Alu (unused) Buri (unused) Dodo (unused) Emau (unused) Fere (unused)
Hibu (unused) Ila (unused) Kama (unused) Lobu (unused) Maila (unused)

Season effects[]

Name Dates active Peak
classification
Sustained
wind speeds
Pressure Areas affected Damages
(AUD)
Damages
(USD)
Deaths Refs
TL 8 August Tropical low Not specified 1005 hPa (29.68 inHg) None None None None
Cempaka 22 November – 1 December Category 1 tropical cyclone 65 km/h (40 mph) 998 hPa (29.47 inHg) Java Unknown Unknown 41 [8]
Dahlia 24 November – 5 December Category 2 tropical cyclone 95 km/h (60 mph) 985 hPa (29.09 inHg) Sumatra, Java None None None
04U 24 – 29 November Tropical low Not specified 1005 hPa (29.68 inHg) Indonesia None None None
05U 1 – 2 December Tropical low Not specified Not specified None None None None
Hilda 26 – 30 December Category 2 tropical cyclone 95 km/h (60 mph) 980 hPa (28.94 inHg) Western Australia Minor Minor None
07U 1 – 2 January Tropical low Not specified 1006 hPa (29.71 inHg) None None None None
Irving 3 – 6 January Category 1 tropical cyclone 75 km/h (45 mph) 993 hPa (29.32 inHg) None None None None
Joyce 6 – 14 January Category 1 tropical cyclone 85 km/h (50 mph) 982 hPa (29.00 inHg) Western Australia None None None
TL 6 – 7 January Tropical low Not specified Not specified Christmas Island None None None
TL 14 – 19 January Tropical low Not specified Not specified Christmas Island None None None
TL 20 January – Present Tropical low Not specified 999 hPa (29.50 inHg) Top End None None None
Season Aggregates
12 systems 8 August –
Season ongoing
95 km/h (60 mph) 980 hPa (28.94 inHg) Unknown Unknown 41


See also[]

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. 
  2. ^ "BULETIN INFORMASI SIKLON TROPIS Depresi Tropis 95S". Badan Meteorologi Klimatologi Dan Geofisika. 26 November 2017. 
  3. ^ http://www.webcitation.org/6vILNfd38
  4. ^ "BULETIN INFORMASI SIKLON TROPIS Siklon Tropis CEMPAKA". Badan Meteorologi Klimatologi Dan Geofisika. 27 November 2017. 
  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. 
  7. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Monday 4 December 2017". 1 December 2017. 
  8. ^ a b "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. 
  11. ^ "Tropical Cyclone 01S (Dahlia) Warning Nr 001". Joint Typhoon Warning Center. 30 November 2017. 
  12. ^ "Trpical Cyclone Dahlia". Australian Bureau of Meteorology. 1 December 2017. 
  13. ^ "Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 1 December 2017. 
  14. ^ "Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 2 December 2017. 
  15. ^ "Ex-Tropical Cyclone Dahlia". Australian Bureau of Meteorology. 4 December 2017. 
  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. 
  17. ^ a b c d Tropical Cyclone Hilda (Report). Australian Bureau of Meteorology. January 2018. Archived from the original on 17 January 2018. Retrieved 17 January 2018. 
  18. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Saturday 6 January 2018". Australian Bureau of Meteorology. 3 January 2018. 
  19. ^ a b "Tropical Low 08U". Australian Bureau of Meteorology. 5 January 2018. 
  20. ^ "Tropical Cyclone Irving". Australian Bureau of Meteorology. 6 January 2018. 
  21. ^ "Tropical Cyclone 04S (Irving) Warning Nr 001". Joint Typhoon Warning Center. 6 January 2018. 
  22. ^ "Tropical Cyclone Irving". Australian Bureau of Meteorology. 6 January 2018. 
  23. ^ http://www.abc.net.au/news/2018-01-16/perth-saturated-as-ex-cyclone-joyce-brings-four-months-of-rain/9332556
  24. ^ a b "WebCite query result". www.webcitation.org. Archived from the original on 2017-08-08. Retrieved 2017-08-08. 
  25. ^ Meteorology, corporateName=Bureau of. "Tropical Cyclones". www.bom.gov.au. Retrieved 2017-08-08. 
  26. ^ "Meteo-France Tropical Bulletin (8 August 2017)" (PDF). 
  27. ^ a b "WebCite query result". www.webcitation.org. Archived from the original on 2017-08-08. Retrieved 2017-08-08. 
  28. ^ "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. 
  29. ^ "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. 
  30. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Monday 4 December 2017". Australian Bureau of Meteorology. 1 December 2017. 
  31. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Tuesday 5 December 2017". Australian Bureau of Meteorology. 2 December 2017. 
  32. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Thursday 4 January 2018". Australian Bureau of Meteorology. 1 January 2018. 
  33. ^ "Tropical Cyclone Outlook for the Western Region for the period until midnight WST Friday 5 January 2018". Australian Bureau of Meteorology. 2 January 2018. 
  34. ^ a b "Tropical Cyclone Operational plan for the South Pacific & Southeast Indian Ocean, 2014 Edition" (PDF). WMO. Retrieved 2016-06-12. 
  35. ^ Gary Padgett (2008). "Monthly Global Tropical Cyclone Summary October". Australian Severe Weather. Archived from the original on 2013-07-04. Retrieved 2013-07-01. 

External links[]